# Image Signal Processor

## Introduction

ESP32-P4 includes an Image Signal Processor (ISP), which is a feature pipeline that consists of many image processing algorithms. ISP receives image data from the DVP camera or MIPI-CSI camera, or system memory, and writes the processed image data to the system memory through DMA. The ISP is designed to work with other camera controller modules and cannot operate independently.

## Terminology

- MIPI-CSI: Camera serial interface, a high-speed serial interface for cameras compliant with MIPI specifications

- DVP: Digital video parallel interface, generally composed of vsync, hsync, de, and data signals

- RAW: Unprocessed data directly output from an image sensor, typically divided into R, Gr, Gb, and B four channels classified into RAW8, RAW10, RAW12, etc., based on bit width

- RGB: Colored image format composed of red, green, and blue colors classified into RGB888, RGB565, etc., based on the bit width of each color

- YUV: Colored image format composed of luminance and chrominance classified into YUV444, YUV422, YUV420, etc., based on the data arrangement

- AF: Auto-focus

- AWB: Auto-white balance

- BF: Bayer noise filter

- CCM: Color correction matrix

## ISP Pipeline

ISP Pipeline

## Functional Overview

The ISP driver offers following services:

- Resource Allocation - covers how to allocate ISP resources with properly set of configurations. It also covers how to recycle the resources when they finished working.

- Enable and disable ISP processor - covers how to enable and disable an ISP processor.

- Get AF statistics in one shot or continuous way - covers how to get AF statistics one-shot or continuously.

- Get AE statistics in one shot or continuous way - covers how to get AE statistics one-shot or continuously.

- Get AWB statistics in one shot or continuous way - covers how to get AWB white patches statistics one-shot or continuously.

- Get histogram statistics in one shot or continuous way - covers how to get histogram statistics one-shot or continuously.

- Enable BF function - covers how to enable and configure BF function.

- Enable LSC function - covers how to enable and configure LSC function.

- Configure CCM - covers how to configure the Color Correction Matrix.

- Configure Demosaic - covers how to config the Demosaic function.

- Enable Gamma Correction - covers how to enable and configure gamma correction.

- Configure Sharpen - covers how to config the Sharpen function.

- Register callback - covers how to hook user specific code to ISP driver event callback function.

- Thread Safety - lists which APIs are guaranteed to be thread safe by the driver.

- Kconfig Options - lists the supported Kconfig options that can bring different effects to the driver.

- IRAM SAFE - describes tips on how to make the ISP interrupt and control functions work better along with a disabled cache.

### Resource Allocation

#### Install ISP Driver

ISP driver requires the configuration that specified by `esp_isp_processor_cfg_t`.

If the configurations in `esp_isp_processor_cfg_t` is specified, users can call `esp_isp_new_processor()` to allocate and initialize an ISP processor. This function will return an ISP processor handle if it runs correctly. You can take following code as reference.

    esp_isp_processor_cfg_t isp_config = {
        .clk_src = ISP_CLK_SRC_DEFAULT,
        ...
    };

    isp_proc_handle_t isp_proc = NULL;
    ESP_ERROR_CHECK(esp_isp_new_processor(&isp_config, &isp_proc));

You can use the created handle to do driver enable / disable the ISP driver and do other ISP module installation.

#### Install ISP Auto-Focus (AF) Driver

ISP auto-focus (AF) driver requires the configuration that specified by `esp_isp_af_config_t`.

If the configurations in `esp_isp_af_config_t` is specified, users can call `esp_isp_new_af_controller()` to allocate and initialize an ISP AF processor. This function will return an ISP AF processor handle if it runs correctly. You can take following code as reference.

    esp_isp_af_config_t af_config = {
        .edge_thresh = 128,
    };
    isp_af_ctlr_t af_ctrlr = NULL;
    ESP_ERROR_CHECK(esp_isp_new_af_controller(isp_proc, &af_config, &af_ctrlr));

You can use the created handle to do driver enable / disable the ISP AF driver and ISP AF Env module installation.

#### Install ISP Auto-White-Balance (AWB) Driver

ISP auto-white-balance (AWB) driver requires the configuration specified by `esp_isp_awb_config_t`.

If an `esp_isp_awb_config_t` configuration is specified, you can call `esp_isp_new_awb_controller()` to allocate and initialize an ISP AWB processor. This function will return an ISP AWB processor handle on success. You can take following code as reference.

    isp_awb_ctlr_t awb_ctlr = NULL;
    uint32_t image_width = 800;
    uint32_t image_height = 600;
    /* The AWB configuration, please refer to the API comment for how to tune these parameters */
    esp_isp_awb_config_t awb_config = {
        .sample_point = ISP_AWB_SAMPLE_POINT_AFTER_CCM,
        ...
    };
    ESP_ERROR_CHECK(esp_isp_new_awb_controller(isp_proc, &awb_config, &awb_ctlr));

The AWB handle created in this step is required by other AWB APIs and AWB scheme.

#### Install ISP Auto-Exposure (AE) Driver

ISP auto-exposure (AE) driver requires the configuration that specified by `esp_isp_ae_config_t`.

If the configurations in `esp_isp_ae_config_t` is specified, users can call `esp_isp_new_ae_controller()` to allocate and initialize an ISP AE processor. This function will return an ISP AE processor handle if it runs correctly. You can take following code as reference.

    esp_isp_ae_config_t ae_config = {
        .sample_point = ISP_AE_SAMPLE_POINT_AFTER_DEMOSAIC,
        ...
    };
    isp_ae_ctlr_t ae_ctlr = NULL;
    ESP_ERROR_CHECK(esp_isp_new_ae_controller(isp_proc, &ae_config, &ae_ctlr));

You can use the created handle to do driver enable / disable the ISP AE driver and ISP AE environment detector setup.

#### Install ISP histogram (HIST) Driver

ISP histogram (HIST) driver requires the configuration that specified by `esp_isp_hist_config_t`.

If the configurations in `esp_isp_hist_config_t` is specified, users can call `esp_isp_new_hist_controller()` to allocate and initialize an ISP Histogram processor. This function will return an ISP HIST processor handle if it runs correctly. You can take following code as reference.

- The sum of all subwindows weight's decimal value should be 256 or the statistics will be small, and integer value should be 0.

- The sum of all RGB coefficients' decimal value should be 256 or the statistics will be small, and integer value should be 0.

- The segment_threshold must be 0 ~ 255 and in order

    esp_isp_hist_config_t hist_cfg = {
        .segment_threshold = {16, 32, 48, 64, 80, 96, 112, 128, 144, 160, 176, 192, 208, 224, 240},
        .hist_mode = ISP_HIST_SAMPLING_RGB,
        .rgb_coefficient.coeff_r = {
            .integer = 0,
            .decimal = 86,
        },
        .rgb_coefficient.coeff_g = {
            .integer = 0,
            .decimal = 85,
        },
        .rgb_coefficient.coeff_b = {
            .integer = 0,
            .decimal = 85,
        },
        .window_weight = {
            {{16, 0}}, {{10, 0}}, {{10, 0}}, {{10, 0}}, {{10, 0}},
            {{10, 0}}, {{10, 0}}, {{10, 0}}, {{10, 0}}, {{10, 0}},
            {{10, 0}}, {{10, 0}}, {{10, 0}}, {{10, 0}}, {{10, 0}},
            {{10, 0}}, {{10, 0}}, {{10, 0}}, {{10, 0}}, {{10, 0}},
            {{10, 0}}, {{10, 0}}, {{10, 0}}, {{10, 0}}, {{10, 0}},
        },
    };
    isp_hist_ctlr_t hist_ctlr_ctlr = NULL;
    ESP_ERROR_CHECK(esp_isp_new_hist_controller(isp_proc, &hist_config, &hist_ctlr));

You can use the created handle to do driver enable / disable the ISP HIST driver setup.

#### Uninstall ISP Driver(s)

If a previously installed ISP driver(s) are not needed, it's recommended to recycle the resource by following APIs to release the underlying hardware:

- `esp_isp_del_processor()`, for ISP processor.

- `esp_isp_del_af_controller()`, for ISP AF processor.

- `esp_isp_del_awb_controller()`, for ISP AWB processor.

- `esp_isp_del_ae_controller()`, for ISP AE processor.

- `esp_isp_del_hist_controller()`, for ISP Histogram processor.

### Enable and Disable ISP

#### ISP

Before doing ISP pipeline, you need to enable the ISP processor first, by calling `esp_isp_enable()`. This function:

- Switches the driver state from init to enable.

Calling `esp_isp_disable()` does the opposite, that is, put the driver back to the init state.

#### ISP AF Processor

Before doing ISP AF, you need to enable the ISP AF processor first, by calling `esp_isp_af_controller_enable()`. This function:

- Switches the driver state from init to enable.

Calling `esp_isp_af_controller_disable()` does the opposite, that is, put the driver back to the init state.

### AF One-shot and Continuous Statistics

Calling `esp_isp_af_controller_get_oneshot_statistics()` to get oneshot AF statistics result. You can take following code as reference.

Aside from the above oneshot API, the ISP AF driver also provides a way to start AF statistics continuously. Calling `esp_isp_af_controller_start_continuous_statistics()` to start the continuous statistics and `esp_isp_af_controller_stop_continuous_statistics()` to stop it.

Note that if you want to use the continuous statistics, you need to register the `esp_isp_af_env_detector_evt_cbs_t::on_env_statistics_done` or `esp_isp_af_env_detector_evt_cbs_t::on_env_change` callback to get the statistics result. See how to register in Register Event Callbacks

Note

When you use the continuous statistics, AF Environment Detector will be invalid.

    esp_isp_af_config_t af_config = {
        .edge_thresh = 128,
    };
    isp_af_ctlr_t af_ctrlr = NULL;
    ESP_ERROR_CHECK(esp_isp_new_af_controller(isp_proc, &af_config, &af_ctrlr));
    ESP_ERROR_CHECK(esp_isp_af_controller_enable(af_ctrlr));
    isp_af_result_t result = {};
    /* Trigger the AF statistics and get its result for one time with timeout value 2000ms. */
    ESP_ERROR_CHECK(esp_isp_af_controller_get_oneshot_statistics(af_ctrlr, 2000, &result));

    /* Start continuous AF statistics */
    ESP_ERROR_CHECK(esp_isp_af_controller_start_continuous_statistics(af_ctrlr));
    // You can do other stuffs here, the statistics result can be obtained in the callback
    // ......
    // vTaskDelay(pdMS_TO_TICKS(1000));
    /* Stop continuous AF statistics */
    ESP_ERROR_CHECK(esp_isp_af_controller_stop_continuous_statistics(af_ctrlr));

    /* Disable the af controller */
    ESP_ERROR_CHECK(esp_isp_af_controller_disable(af_ctrlr));
    /* Delete the af controller and free the resources */
    ESP_ERROR_CHECK(esp_isp_del_af_controller(af_ctrlr));

### Set AF Environment Detector

Calling `esp_isp_af_controller_set_env_detector()` to set an ISP AF environment detector. You can take following code as reference.

    esp_isp_af_env_config_t env_config = {
        .interval = 10,
    };
    isp_af_ctlr_t af_ctrlr = NULL;
    ESP_ERROR_CHECK(esp_isp_new_af_controller(isp_proc, &af_config, &af_ctrlr));
    ESP_ERROR_CHECK(esp_isp_af_controller_set_env_detector(af_ctrlr, &env_config));

### Set AF Environment Detector Threshold

Calling `esp_isp_af_env_detector_set_threshold()` to set the threshold of an ISP AF environment detector.

    int definition_thresh = 0;
    int luminance_thresh = 0;
    ESP_ERROR_CHECK(esp_isp_af_env_detector_set_threshold(env_detector, definition_thresh, luminance_thresh));

## ISP AE Processor

Before doing ISP AE, you need to enable the ISP AE processor first, by calling `esp_isp_ae_controller_enable()`. This function:

- Switches the driver state from init to enable.

Calling `esp_isp_ae_controller_disable()` does the opposite, that is, put the driver back to the init state.

### AE One-shot and Continuous Statistics

Calling `esp_isp_ae_controller_get_oneshot_statistics()` to get oneshot AE statistics result. You can take following code as reference.

When you use AE oneshot statistics, the AE continuous mode need to be disabled otherwise the result may be overwritten by the environment detector. After oneshot operation finishes, you need to restart continuous mode again.

Aside from the above oneshot API, the ISP AE driver also provides a way to start AE statistics continuously. Calling `esp_isp_ae_controller_start_continuous_statistics()` to start the continuous statistics and `esp_isp_ae_controller_stop_continuous_statistics()` to stop it.

Note that if you want to use the continuous statistics, you need to register the `esp_isp_ae_env_detector_evt_cbs_t::on_statistics_done` or `esp_isp_ae_env_detector_evt_cbs_t::on_change` callback to get the statistics result. See how to register in Register Event Callbacks

Note

When using oneshot statistics, the AE Environment Detector will be temporarily disabled and will automatically recover once the oneshot is complete.

    esp_isp_ae_config_t ae_config = {
        .sample_point = ISP_AE_SAMPLE_POINT_AFTER_DEMOSAIC,
    };
    isp_ae_ctlr_t ae_ctlr = NULL;
    ESP_ERROR_CHECK(esp_isp_new_ae_controller(isp_proc, &ae_config, &ae_ctlr));
    ESP_ERROR_CHECK(esp_isp_ae_controller_enable(ae_ctlr));
    isp_ae_result_t result = {};
    /* Trigger the AE statistics and get its result for one time with timeout value 2000ms. */
    ESP_ERROR_CHECK(esp_isp_ae_controller_get_oneshot_statistics(ae_ctlr, 2000, &result));

    /* Start continuous AE statistics */
    ESP_ERROR_CHECK(esp_isp_ae_controller_start_continuous_statistics(ae_ctlr));
    // You can do other stuffs here, the statistics result can be obtained in the callback
    // ......
    // vTaskDelay(pdMS_TO_TICKS(1000));
    /* Stop continuous AE statistics */
    ESP_ERROR_CHECK(esp_isp_ae_controller_stop_continuous_statistics(ae_ctlr));

    /* Disable the ae controller */
    ESP_ERROR_CHECK(esp_isp_ae_controller_disable(ae_ctlr));
    /* Delete the ae controller and free the resources */
    ESP_ERROR_CHECK(esp_isp_del_ae_controller(ae_ctlr));

### Set AE Environment Detector

Calling `esp_isp_ae_controller_set_env_detector()` to set an ISP AE environment detector. You can take following code as reference.

    esp_isp_ae_env_config_t env_config = {
        .interval = 10,
    };
    ESP_ERROR_CHECK(esp_isp_ae_controller_set_env_detector(ae_ctlr, &env_config));

### Set AE Environment Detector Threshold

Calling `esp_isp_ae_controller_set_env_detector_threshold()` to set the thresholds(1-255) of an ISP AE environment detector.

    esp_isp_ae_env_thresh_t env_thresh = {
        .low_thresh = 110,
        .high_thresh = 130,
    };
    ESP_ERROR_CHECK(esp_isp_ae_controller_set_env_detector_threshold(ae_ctlr, env_thresh));

#### ISP AWB Processor

Before doing ISP AWB, you need to enable the ISP AWB processor first, by calling `esp_isp_awb_controller_enable()`. This function:

- Switches the driver state from init to enable.

Calling `esp_isp_awb_controller_disable()` does the opposite, that is, put the driver back to the init state.

### AWB One-shot and Continuous Statistics

Calling `esp_isp_awb_controller_get_oneshot_statistics()` to get oneshot AWB statistics result of white patches. You can take following code as reference.

Aside from the above oneshot API, the ISP AWB driver also provides a way to start AWB statistics continuously. Calling `esp_isp_awb_controller_start_continuous_statistics()` starts the continuous statistics and `esp_isp_awb_controller_stop_continuous_statistics()` stops it.

Note that if you want to use the continuous statistics, you need to register the `esp_isp_awb_cbs_t::on_statistics_done` callback to get the statistics result. See how to register it in Register Event Callbacks

    bool example_isp_awb_on_statistics_done_cb(isp_awb_ctlr_t awb_ctlr, const esp_isp_awb_evt_data_t *edata, void *user_data);
    // ...
    isp_awb_ctlr_t awb_ctlr = NULL;
    uint32_t image_width = 800;
    uint32_t image_height = 600;
    /* The AWB configuration, please refer to the API comment for how to tune these parameters */
    esp_isp_awb_config_t awb_config = {
        .sample_point = ISP_AWB_SAMPLE_POINT_AFTER_CCM,
        ...
    };
    isp_awb_stat_result_t stat_res = {};
    /* Create the awb controller */
    ESP_ERROR_CHECK(esp_isp_new_awb_controller(isp_proc, &awb_config, &awb_ctlr));
    /* Register AWB callback */
    esp_isp_awb_cbs_t awb_cb = {
        .on_statistics_done = example_isp_awb_on_statistics_done_cb,
    };
    ESP_ERROR_CHECK(esp_isp_awb_register_event_callbacks(awb_ctlr, &awb_cb, NULL));
    /* Enabled the awb controller */
    ESP_ERROR_CHECK(esp_isp_awb_controller_enable(awb_ctlr));

    /* Get oneshot AWB statistics result */
    ESP_ERROR_CHECK(esp_isp_awb_controller_get_oneshot_statistics(awb_ctlr, -1, &stat_res));

    /* Start continuous AWB statistics, note that continuous statistics requires `on_statistics_done` callback */
    ESP_ERROR_CHECK(esp_isp_awb_controller_start_continuous_statistics(awb_ctlr));
    // You can do other stuffs here, the statistics result can be obtained in the callback
    // ......
    // vTaskDelay(pdMS_TO_TICKS(1000));
    /* Stop continuous AWB statistics */
    ESP_ERROR_CHECK(esp_isp_awb_controller_stop_continuous_statistics(awb_ctlr));

    /* Disable the awb controller */
    ESP_ERROR_CHECK(esp_isp_awb_controller_disable(awb_ctlr));
    /* Delete the awb controller and free the resources */
    ESP_ERROR_CHECK(esp_isp_del_awb_controller(awb_ctlr));

## ISP histogram Processor

Before doing ISP histogram statistics, you need to enable the ISP histogram processor first, by calling `esp_isp_hist_controller_enable()`. This function:

- Switches the driver state from init to enable.

Calling `esp_isp_hist_controller_disable()` does the opposite, that is, put the driver back to the init state.

### Histogram One-shot and Continuous Statistics

Calling `esp_isp_hist_controller_get_oneshot_statistics()` to get oneshot histogram statistics result. You can take following code as reference.

Aside from the above oneshot API, the ISP histogram driver also provides a way to start histogram statistics continuously. Calling `esp_isp_hist_controller_start_continuous_statistics()` starts the continuous statistics and `esp_isp_hist_controller_stop_continuous_statistics()` stops it.

Note that if you want to use the continuous statistics, you need to register the `esp_isp_hist_cbs_t::on_statistics_done` callback to get the statistics result. See how to register it in Register Event Callbacks

    static bool s_hist_scheme_on_statistics_done_callback(isp_hist_ctlr_t awb_ctrlr, const esp_isp_hist_evt_data_t *edata, void *user_data)
    {
        for(int i = 0; i < 16; i++) {
            esp_rom_printf(DRAM_STR("val %d is %x\n"), i, edata->hist_result.hist_value[i]); // get the histogram statistic value
        }
        return true;
    }

    esp_isp_hist_cbs_t hist_cbs = {
        .on_statistics_done = s_hist_scheme_on_statistics_done_callback,
    };

    esp_isp_hist_register_event_callbacks(hist_ctlr, &hist_cbs, hist_ctlr);
    esp_isp_hist_controller_enable(hist_ctlr);

#### ISP BF Processor

This pipeline is used for doing image input denoising under bayer mode.

Calling `esp_isp_bf_configure()` to configure BF function, you can take following code as reference.

    esp_isp_bf_config_t bf_config = {
        .denoising_level = 5,
        .bf_template = {
            {1, 2, 1},
            {2, 4, 2},
            {1, 2, 1},
        },
        ...
    };
    ESP_ERROR_CHECK(esp_isp_bf_configure(isp_proc, &bf_config));
    ESP_ERROR_CHECK(esp_isp_bf_enable(isp_proc));

`esp_isp_bf_config_t::bf_template` is used for bayer denoise. You can set the `esp_isp_bf_config_t::bf_template` with a Gaussian filter template or an average filter template.

After calling `esp_isp_bf_configure()`, you need to enable the ISP BF processor, by calling `esp_isp_bf_enable()`. This function:

- Switches the driver state from init to enable.

Calling `esp_isp_bf_disable()` does the opposite, that is, put the driver back to the init state.

#### ISP LSC Controller

Lens Shading Correction (LSC) aims for the issues caused by the uneven refraction of light through the camera lens.

Calling `esp_isp_lsc_configure()` to configure the LSC module to do the correction. The `esp_isp_lsc_gain_array_t` is necessary for the hardware to do the correction related calculation. `esp_isp_lsc_allocate_gain_array()` is a helper function to help allocate proper size of memory for the gains.

    esp_isp_lsc_gain_array_t gain_array = {};
    size_t gain_size = 0;
    ESP_ERROR_CHECK(esp_isp_lsc_allocate_gain_array(isp_proc, &gain_array, &gain_size));

    esp_isp_lsc_config_t lsc_config = {
        .gain_array = &gain_array,
    };
    isp_lsc_gain_t gain_val = {
        .decimal = 204,
        .integer = 0,
    };
    for (int i = 0; i < gain_size; i++) {
        gain_array.gain_r[i].val = gain_val.val;
        gain_array.gain_gr[i].val = gain_val.val;
        gain_array.gain_gb[i].val = gain_val.val;
        gain_array.gain_b[i].val = gain_val.val;
    }
    ESP_ERROR_CHECK(esp_isp_lsc_configure(isp_proc, &lsc_config));

After calling `esp_isp_lsc_configure()`, you need to enable the ISP LSC controller, by calling `esp_isp_lsc_enable()`. The LSC can be disabled by calling `esp_isp_lsc_disable()`. It's allowed to call `esp_isp_lsc_configure()` when the LSC isn't enabled, but the LSC function will only take effect when it's enabled.

#### ISP Color Processor

This pipeline is used to adjust the image contrast, saturation, hue and brightness.

Calling `esp_isp_color_configure()` to configure color function, you can take following code as reference.

- Contrast value should be 0 ~ 1.0, default 1.0

- Saturation value should be 0 ~ 1.0, default 1.0

- Hue value should be 0 ~ 360, default 0

- Brightness value should be --127 ~ 128, default 0

    esp_isp_color_config_t color_config = {
        .color_contrast = {
            .integer = 1,
            .decimal = 0,
        },
        .color_saturation = {
            .integer = 1,
            .decimal = 0,
        },
        .color_hue = 0,
        .color_brightness = 0,
    };
    ESP_ERROR_CHECK(esp_isp_color_configure(isp_proc, &color_config));
    ESP_ERROR_CHECK(esp_isp_color_enable(isp_proc));

After calling `esp_isp_color_configure()`, you need to enable the ISP color processor, by calling `esp_isp_color_enable()`. This function:

- Switches the driver state from init to enable.

Calling `esp_isp_color_disable()` does the opposite, that is, put the driver back to the init state.

Note

When the ISP DVP peripheral is used with the output color format set to the RGB color space, ISP Color Processor is automatically enabled in the camera driver to ensure correct data output. The function `esp_isp_color_disable()` should never be called in this case, otherwise it may result in disarrayed camera data.

### Configure CCM

Color Correction Matrix can scale the color ratio of RGB888 pixels. It can be used for adjusting the image color via some algorithms, for example, used for white balance by inputting the AWB computed result, or used as a Filter with some filter algorithms.

To adjust the color correction matrix, here is the formula:

    [ R' ]     [ RR  RG  RB  ]   [ R ]
    [ G' ] =   [ GR  GG  GB  ] * [ G ]
    [ B' ]     [ BR  BG  BB  ]   [ B ]

, and you can refer to the following code:

    // ...
    // Configure CCM
    esp_isp_ccm_config_t ccm_cfg = {
        .matrix = {
            1.0, 0.0, 0.0,
            0.0, 1.0, 0.0,
            0.0, 0.0, 1.0
        },
        .saturation = false,
        ...
    };
    ESP_ERROR_CHECK(esp_isp_ccm_configure(isp_proc, &ccm_cfg));
    // The configured CCM will be applied to the image once the CCM module is enabled
    ESP_ERROR_CHECK(esp_isp_ccm_enable(isp_proc));
    // CCM can also be configured after it is enabled
    ccm_cfg.matrix[0][0] = 2.0;
    ESP_ERROR_CHECK(esp_isp_ccm_configure(isp_proc, &ccm_cfg));
    // Disable CCM if no longer needed
    ESP_ERROR_CHECK(esp_isp_ccm_disable(isp_proc));

#### ISP Demosaic Processor

This pipeline is used for doing image demosaic algorithm to convert RAW image to RGB mode.

Calling `esp_isp_demosaic_configure()` to configure Demosaic function, you can take following code as reference.

    esp_isp_demosaic_config_t demosaic_config = {
        .grad_ratio = {
            .integer = 2,
            .decimal = 5,
        },
        ...
    };

    ESP_ERROR_CHECK(esp_isp_demosaic_configure(isp_proc, &sharpen_config));
    ESP_ERROR_CHECK(esp_isp_demosaic_enable(isp_proc));

After calling `esp_isp_demosaic_configure()`, you need to enable the ISP Sharpen processor, by calling `esp_isp_demosaic_enable()`. This function:

- Switches the driver state from init to enable.

Calling `esp_isp_demosaic_disable()` does the opposite, that is, put the driver back to the init state.

`esp_isp_demosaic_configure()` is allowed to be called even if the driver is in init state, but the demosaic configurations will only be taken into effect when in enable state.

### Enable Gamma Correction

The human visual system is non-linearly sensitive to the physical luminance. Adding gamma correction to the ISP pipeline to transforms RGB coordinates into a space in which coordinates are proportional to subjective brightness.

The driver provides a helper API `esp_isp_gamma_fill_curve_points()` to fill `isp_gamma_curve_points_t`, which is a group of points used to describe the gamma correction curve. Or you can manually declare the points as your desired 'gamma' correction curve. Each R / G / B component can have its own gamma correction curve, you can set the configuration by calling `esp_isp_gamma_configure()`.

A typical code example is:

    #include <math.h>

    // Set the camera gamma to be 0.7, so the gamma correction curve is y = 256 * (x / 256) ^ 0.7
    static uint32_t s_gamma_curve(uint32_t x)
    {
        return pow((double)x / 256, 0.7) * 256;
    }

    isp_gamma_curve_points_t pts = {};
    ESP_ERROR_CHECK(esp_isp_gamma_fill_curve_points(s_gamma_curve, &pts));
    ESP_ERROR_CHECK(esp_isp_gamma_configure(isp_proc, COLOR_COMPONENT_R, &pts));
    ESP_ERROR_CHECK(esp_isp_gamma_configure(isp_proc, COLOR_COMPONENT_G, &pts));
    ESP_ERROR_CHECK(esp_isp_gamma_configure(isp_proc, COLOR_COMPONENT_B, &pts));

    // Enable gamma module after curve parameters configured
    ESP_ERROR_CHECK(esp_isp_gamma_enable(isp_proc));

    // Disable gamma if no longer needed
    ESP_ERROR_CHECK(esp_isp_gamma_disable(isp_proc));

#### ISP Sharpen Processor

This pipeline is used for doing image input sharpening under YUV mode.

Calling `esp_isp_sharpen_configure()` to configure Sharpen function, you can take following code as reference.

    esp_isp_sharpen_config_t sharpen_config = {
        .h_thresh = 255,
        .sharpen_template = {
            {1, 2, 1},
            {2, 4, 2},
            {1, 2, 1},
        },
        ...
    };
    ESP_ERROR_CHECK(esp_isp_sharpen_configure(isp_proc, &sharpen_config));
    ESP_ERROR_CHECK(esp_isp_sharpen_enable(isp_proc));

`esp_isp_sharpen_config_t::sharpen_template` is used for sharpening. You can set the `esp_isp_sharpen_config_t::sharpen_template` with a Gaussian filter template or an average filter template.

After calling `esp_isp_sharpen_configure()`, you need to enable the ISP Sharpen processor, by calling `esp_isp_sharpen_enable()`. This function:

- Switches the driver state from init to enable.

Calling `esp_isp_sharpen_disable()` does the opposite, that is, put the driver back to the init state.

`esp_isp_sharpen_configure()` is allowed to be called even if the driver is in init state, but the sharpen configurations will only be taken into effect when in enable state.

### Register Event Callbacks

After an ISP module starts up, it can generate a specific event dynamically. You can save your own context to callback function as well, via the parameter `user_data`. The user data will be directly passed to the callback function.

Note

The below mentioned callback functions are called within an ISR context, you must ensure that the functions do not attempt to block (e.g., by making sure that only FreeRTOS APIs with `ISR` suffix are called from within the function).

#### Register ISP Processor Event Callbacks

After the ISP processor is enabled, it can generate multiple events of multiple ISP submodules dynamically. You can hook your functions to the interrupt service routine by calling `esp_isp_register_event_callbacks()`. All supported event callbacks are listed in `esp_isp_evt_cbs_t`:

- `esp_isp_evt_cbs_t::on_sharpen_frame_done`. sets a callback function for sharpen frame done. It will be called after the ISP sharpen submodule finishes its operation for one frame. The function prototype is declared in `esp_isp_sharpen_callback_t`.

#### Register ISP AF Environment Detector Event Callbacks

After the ISP AF environment detector starts up, it can generate a specific event dynamically. If you have some functions that should be called when the event happens, please hook your function to the interrupt service routine by calling `esp_isp_af_env_detector_register_event_callbacks()`. All supported event callbacks are listed in `esp_isp_af_env_detector_evt_cbs_t`:

- `esp_isp_af_env_detector_evt_cbs_t::on_env_statistics_done` sets a callback function for environment statistics done. The function prototype is declared in `esp_isp_af_env_detector_callback_t`.

- `esp_isp_af_env_detector_evt_cbs_t::on_env_change` sets a callback function for environment change. The function prototype is declared in `esp_isp_af_env_detector_callback_t`.

#### Register ISP AWB Statistics Done Event Callbacks

After the ISP AWB controller finished statistics of white patches, it can generate a specific event dynamically. If you want to be informed when the statistics done event takes place, please hook your function to the interrupt service routine by calling `esp_isp_awb_register_event_callbacks()`. All supported event callbacks are listed in `esp_isp_awb_cbs_t`:

- `esp_isp_awb_cbs_t::on_statistics_done` sets a callback function when finished statistics of the white patches. The function prototype is declared in `esp_isp_awb_callback_t`.

#### Register ISP AE Environment Detector Event Callbacks

After the ISP AE environment detector starts up, it can generate a specific event dynamically. If you have some functions that should be called when the event happens, please hook your function to the interrupt service routine by calling `esp_isp_ae_env_detector_register_event_callbacks()`. All supported event callbacks are listed in `esp_isp_ae_env_detector_evt_cbs_t`:

- `esp_isp_ae_env_detector_evt_cbs_t::on_env_statistics_done` sets a callback function for environment statistics done. . The function prototype is declared in `esp_isp_ae_env_detector_callback_t`.

- `esp_isp_ae_env_detector_evt_cbs_t::on_env_change` sets a callback function for environment change. . The function prototype is declared in `esp_isp_ae_env_detector_callback_t`.

#### Register ISP HIST Statistics Done Event Callbacks

After the ISP HIST controller finished statistics of brightness, it can generate a specific event dynamically. If you want to be informed when the statistics done event takes place, please hook your function to the interrupt service routine by calling `esp_isp_hist_register_event_callbacks()`. All supported event callbacks are listed in `esp_isp_hist_cbs_t`:

- `esp_isp_hist_cbs_t::on_statistics_done` sets a callback function when finished statistics of the brightness. . The function prototype is declared in `esp_isp_hist_callback_t`.

### Thread Safety

The factory function

- `esp_isp_new_processor()`

- `esp_isp_del_processor()`

- `esp_isp_new_af_controller()`

- `esp_isp_del_af_controller()`

- `esp_isp_new_awb_controller()`

- `esp_isp_del_awb_controller()`

- `esp_isp_new_ae_controller()`

- `esp_isp_del_ae_controller()`

- `esp_isp_new_hist_controller()`

- `esp_isp_del_hist_controller()`

are guaranteed to be thread safe by the driver, which means, user can call them from different RTOS tasks without protection by extra locks. Other APIs are not guaranteed to be thread-safe.

### Kconfig Options

- CONFIG_ISP_ISR_IRAM_SAFE controls whether the default ISR handler should be masked when the cache is disabled

### IRAM Safe

By default, the ISP interrupt will be deferred when the cache is disabled because of writing or erasing the flash.

Kconfig option CONFIG_ISP_ISR_IRAM_SAFE will:

- Enable the interrupt being serviced even when the cache is disabled

- Place all functions that used by the ISR into IRAM

- Place driver object into DRAM (in case it is mapped to PSRAM by accident)

This allows the interrupt to run while the cache is disabled, but comes at the cost of increased IRAM consumption. With this option enabled, the ISR callbacks will be running when cache is disabled. Therefore you should make sure the callbacks and its involved context are IRAM-safe as well.

Kconfig option CONFIG_ISP_CTRL_FUNC_IN_IRAM will:

- Place some of ISP control functions into IRAM, function list:

- `esp_isp_sharpen_configure()`

- `esp_isp_demosaic_configure()`

## Application Examples

- peripherals/isp/multi_pipelines demonstrates how to use the ISP pipelines to process the image signals from camera sensors and display the video on LCD screen via DSI peripheral.

## API Reference

### Header File

- components/esp_driver_isp/include/driver/isp.h

- This header file can be included with:

  >     #include "driver/isp.h"

- This header file is a part of the API provided by the `esp_driver_isp` component. To declare that your component depends on `esp_driver_isp`, add the following to your CMakeLists.txt:

  >     REQUIRES esp_driver_isp

  > or

  >     PRIV_REQUIRES esp_driver_isp

### Header File

- components/hal/include/hal/isp_types.h

- This header file can be included with:

  >     #include "hal/isp_types.h"

### Unions

union isp_demosaic_grad_ratio_t
  #include <isp_types.h>

  Gradient ratio.

  Public Members

  uint32_t decimal

    Integer part.

  uint32_t integer

    Decimal part.

  uint32_t reserved

    Reserved.

  struct isp_demosaic_grad_ratio_t::[anonymous] [anonymous]
  uint32_t val

    32-bit gradient ratio value

union isp_sharpen_h_freq_coeff_t
  #include <isp_types.h>

  High freq pixel sharpeness coeff.

  Public Members

  uint32_t decimal

    Decimal part.

  uint32_t integer

    Integer part.

  uint32_t reserved

    Reserved.

  struct isp_sharpen_h_freq_coeff_t::[anonymous] [anonymous]
  uint32_t val

    32-bit high freq pixel sharpeness coeff register value

union isp_sharpen_m_freq_coeff
  #include <isp_types.h>

  Medium freq pixel sharpeness coeff.

  Public Members

  uint32_t decimal

    Decimal part.

  uint32_t integer

    Integer part.

  uint32_t reserved

    Reserved.

  struct isp_sharpen_m_freq_coeff::[anonymous] [anonymous]
  uint32_t val

    32-bit medium freq pixel sharpeness coeff register value

union isp_hist_weight_t
  #include <isp_types.h>

  ISP histogram weight value.

  Public Members

  uint32_t decimal

    Decimal part.

  uint32_t integer

    Integer part.

  uint32_t reserved

    Reserved.

  struct isp_hist_weight_t::[anonymous] [anonymous]
  uint32_t val

    32-bit histogram weight value

union isp_hist_coeff_t
  #include <isp_types.h>

  ISP histogram coefficient value.

  Public Members

  uint32_t decimal

    Decimal part.

  uint32_t integer

    Integer part.

  uint32_t reserved

    Reserved.

  struct isp_hist_coeff_t::[anonymous] [anonymous]
  uint32_t val

    32-bit histogram coefficient value

union isp_color_contrast_t
  #include <isp_types.h>

  Color contrast value.

  Public Members

  uint32_t decimal

    Decimal part.

  uint32_t integer

    Integer part.

  uint32_t reserved

    Reserved.

  struct isp_color_contrast_t::[anonymous] [anonymous]
  uint32_t val

    32-bit color contrast value

union isp_color_saturation_t
  #include <isp_types.h>

  Color saturation value.

  Public Members

  uint32_t decimal

    Decimal part.

  uint32_t integer

    Integer part.

  uint32_t reserved

    Reserved.

  struct isp_color_saturation_t::[anonymous] [anonymous]
  uint32_t val

    32-bit color saturation value

union isp_lsc_gain_t
  #include <isp_types.h>

  LSC gain.

  Public Members

  uint32_t decimal

    Integer part.

  uint32_t integer

    Decimal part.

  uint32_t reserved

    Reserved.

  struct isp_lsc_gain_t::[anonymous] [anonymous]
  uint32_t val

    32-bit gradient ratio value

### Structures

struct isp_coordinate_t

  ISP coordinate type.

  Public Members

  uint32_t x

    X coordinate of the point.

  uint32_t y

    Y coordinate of the point.

struct isp_window_t

  The top left and bottom right coordinates of ISP full window.

  Public Members

  isp_coordinate_t top_left

    The top left point coordinate.

  isp_coordinate_t btm_right

    The bottom right point coordinate.

struct isp_gamma_curve_points_t

  Structure that declares the points on an ISP gamma curve.

  Constraint on pt[n].x: When n = 0, pt[n].x = 2 ^ a[n] When 0 < n < ISP_GAMMA_CURVE_POINTS_NUM-1, pt[n].x - pt[n-1].x = 2 ^ a[n] When n = ISP_GAMMA_CURVE_POINTS_NUM-1, pt[n].x = 255, (pt[n].x + 1) - pt[n-1].x = 2 ^ a[n] a[n] within [0, 7]

  Public Members

  uint8_t x

    Raw value (0, 255].

  uint8_t y

    gamma-corrected value (0, 255]

  struct isp_gamma_curve_points_t::[anonymous] pt[ISP_GAMMA_CURVE_POINTS_NUM]

    Point (x, y)

struct isp_hist_rgb_coefficient_t

  ISP histogram r,g,b coefficient.

  Public Members

  isp_hist_coeff_t coeff_r

    R coefficient.

  isp_hist_coeff_t coeff_g

    G coefficient.

  isp_hist_coeff_t coeff_b

    B coefficient.

struct isp_hist_result_t

  ISP histogram result.

  Public Members

  uint32_t hist_value[ISP_HIST_SEGMENT_NUMS]

    Histogram value, represents the number of pixels that the histogram window's brightness results fall into the segment X.

### Macros

ISP_AE_BLOCK_X_NUM

ISP_AE_BLOCK_Y_NUM

ISP_AF_WINDOW_NUM

ISP_BF_TEMPLATE_X_NUMS

ISP_BF_TEMPLATE_Y_NUMS

ISP_CCM_DIMENSION

  ISP Color Correction Matrix dimension.

ISP_DEMOSAIC_GRAD_RATIO_INT_BITS

ISP_DEMOSAIC_GRAD_RATIO_DEC_BITS

ISP_DEMOSAIC_GRAD_RATIO_RES_BITS

ISP_DVP_DATA_SIG_NUM

ISP_SHARPEN_TEMPLATE_X_NUMS

ISP_SHARPEN_TEMPLATE_Y_NUMS

ISP_SHARPEN_H_FREQ_COEF_INT_BITS

ISP_SHARPEN_H_FREQ_COEF_DEC_BITS

ISP_SHARPEN_H_FREQ_COEF_RES_BITS

ISP_SHARPEN_M_FREQ_COEF_INT_BITS

ISP_SHARPEN_M_FREQ_COEF_DEC_BITS

ISP_SHARPEN_M_FREQ_COEF_RES_BITS

ISP_GAMMA_CURVE_POINTS_NUM

  Number of points to define a gamma correction curve.

ISP_HIST_BLOCK_X_NUM

ISP_HIST_BLOCK_Y_NUM

ISP_HIST_SEGMENT_NUMS

ISP_HIST_INTERVAL_NUMS

ISP_HIST_WEIGHT_INT_BITS

ISP_HIST_WEIGHT_DEC_BITS

ISP_HIST_WEIGHT_RES_BITS

ISP_HIST_COEFF_INT_BITS

ISP_HIST_COEFF_DEC_BITS

ISP_HIST_COEFF_RES_BITS

ISP_COLOR_CONTRAST_INT_BITS

ISP_COLOR_CONTRAST_DEC_BITS

ISP_COLOR_CONTRAST_RES_BITS

ISP_COLOR_SATURATION_INT_BITS

ISP_COLOR_SATURATION_DEC_BITS

ISP_COLOR_SATURATION_RES_BITS

ISP_LSC_GRAD_RATIO_INT_BITS

ISP_LSC_GRAD_RATIO_DEC_BITS

ISP_LSC_GRAD_RATIO_RES_BITS

### Type Definitions

typedef soc_periph_isp_clk_src_t isp_clk_src_t

  Clock source type of ISP.

### Enumerations

enum isp_input_data_source_t

  ISP Input Source.

  Values:

  enumerator ISP_INPUT_DATA_SOURCE_CSI

    Input data from CSI.

  enumerator ISP_INPUT_DATA_SOURCE_DVP

    Input data from DVP.

  enumerator ISP_INPUT_DATA_SOURCE_DWGDMA

    Input data from DW-GDMA.

enum isp_color_t

  ISP Color Type.

  Values:

  enumerator ISP_COLOR_RAW8

    RAW8.

  enumerator ISP_COLOR_RAW10

    RAW10.

  enumerator ISP_COLOR_RAW12

    RAW12.

  enumerator ISP_COLOR_RGB888

    RGB888.

  enumerator ISP_COLOR_RGB565

    RGB565.

  enumerator ISP_COLOR_YUV422

    YUV422.

  enumerator ISP_COLOR_YUV420

    YUV420.

enum isp_color_range_t

  ISP color range.

  Values:

  enumerator ISP_COLOR_RANGE_LIMIT

    Limited color range

  enumerator ISP_COLOR_RANGE_FULL

    Full color range

enum isp_yuv_conv_std_t

  The standard used for conversion between RGB and YUV.

  Values:

  enumerator ISP_YUV_CONV_STD_BT601

    YUV<->RGB conversion standard: BT.601

  enumerator ISP_YUV_CONV_STD_BT709

    YUV<->RGB conversion standard: BT.709

enum isp_ae_sample_point_t

  ISP AE input data source.

  Values:

  enumerator ISP_AE_SAMPLE_POINT_AFTER_DEMOSAIC

    AE input data after demosaic.

  enumerator ISP_AE_SAMPLE_POINT_AFTER_GAMMA

    AE input data after gamma.

enum isp_awb_sample_point_t

  ISP AWB sample point in the ISP pipeline.

  Values:

  enumerator ISP_AWB_SAMPLE_POINT_BEFORE_CCM

    Sample AWB data before CCM (Color Correction Matrix)

  enumerator ISP_AWB_SAMPLE_POINT_AFTER_CCM

    Sample AWB data after CCM (Color Correction Matrix)

enum isp_bf_edge_padding_mode_t

  ISP BF edge padding mode.

  Values:

  enumerator ISP_BF_EDGE_PADDING_MODE_SRND_DATA

    Fill BF edge padding data with surrounding pixel data.

  enumerator ISP_BF_EDGE_PADDING_MODE_CUSTOM_DATA

    Fill BF edge padding data with custom pixel data.

enum isp_demosaic_edge_padding_mode_t

  ISP Demosaic edge padding mode.

  Values:

  enumerator ISP_DEMOSAIC_EDGE_PADDING_MODE_SRND_DATA

    Fill Demosaic edge padding data with surrounding pixel data.

  enumerator ISP_DEMOSAIC_EDGE_PADDING_MODE_CUSTOM_DATA

    Fill Demosaic edge padding data with custom pixel data.

enum isp_sharpen_edge_padding_mode_t

  ISP Sharpen edge padding mode.

  Values:

  enumerator ISP_SHARPEN_EDGE_PADDING_MODE_SRND_DATA

    Fill Sharpen edge padding data with surrounding pixel data.

  enumerator ISP_SHARPEN_EDGE_PADDING_MODE_CUSTOM_DATA

    Fill Sharpen edge padding data with custom pixel data.

enum isp_hist_sampling_mode_t

  ISP histogram mode.

  Values:

  enumerator ISP_HIST_SAMPLING_RAW_B

    histogram mode for B component of raw image

  enumerator ISP_HIST_SAMPLING_RAW_GB

    histogram mode for GB component of raw image

  enumerator ISP_HIST_SAMPLING_RAW_GR

    histogram mode for GR component of raw image

  enumerator ISP_HIST_SAMPLING_RAW_R

    histogram mode for R component of raw image

  enumerator ISP_HIST_SAMPLING_RGB

    histogram mode for RGB

  enumerator ISP_HIST_SAMPLING_YUV_Y

    histogram mode for Y component for YUV

  enumerator ISP_HIST_SAMPLING_YUV_U

    histogram mode for U component for YUV

  enumerator ISP_HIST_SAMPLING_YUV_V

    histogram mode for V component for YUV

### Header File

- components/esp_driver_isp/include/driver/isp_types.h

- This header file can be included with:

  >     #include "driver/isp_types.h"

- This header file is a part of the API provided by the `esp_driver_isp` component. To declare that your component depends on `esp_driver_isp`, add the following to your CMakeLists.txt:

  >     REQUIRES esp_driver_isp

  > or

  >     PRIV_REQUIRES esp_driver_isp

### Structures

struct isp_u32_range_t

  ISP unsigned integer range type.

  Note

  Whether the edge value are included depends on the variable itself

  Public Members

  uint32_t min

    Minimum unsigned int value.

  uint32_t max

    Maximum unsigned int value.

struct isp_float_range_t

  ISP float range type.

  Note

  Whether the edge value are included depends on the variable itself

  Public Members

  float min

    Minimum float value.

  float max

    Maximum float value.

struct isp_af_result_t

  ISP AF result.

  Public Members

  int definition[ISP_AF_WINDOW_NUM]

    Definition, it refers how clear and sharp an image is.

  int luminance[ISP_AF_WINDOW_NUM]

    Luminance, it refers how luminant an image is.

struct isp_awb_stat_result_t

  ISP AWB result.

  Public Members

  uint32_t white_patch_num

    white patch number that counted by AWB in the window

  uint32_t sum_r

    The sum of R channel of these white patches.

  uint32_t sum_g

    The sum of G channel of these white patches.

  uint32_t sum_b

    The sum of B channel of these white patches.

struct isp_ae_result_t

  ISP AE result.

  Public Members

  int luminance[ISP_AE_BLOCK_X_NUM][ISP_AE_BLOCK_Y_NUM]

    Luminance, it refers how luminant an image is.

struct esp_isp_sharpen_evt_data_t

  Event data structure.

  Public Members

  uint8_t high_freq_pixel_max

    high freq pixel max value

struct esp_isp_evt_cbs_t

  Group of ISP event callbacks.

  Note

  These callbacks are all running in an ISR environment.

  Note

  When CONFIG_ISP_ISR_IRAM_SAFE is enabled, the callback itself and functions called by it should be placed in IRAM. Involved variables should be in internal RAM as well.

  Public Members

  esp_isp_sharpen_callback_t on_sharpen_frame_done

    Event callback, invoked when sharpen frame done.

### Type Definitions

typedef struct isp_processor_t *isp_proc_handle_t

  Type of ISP processor handle.

typedef struct isp_af_controller_t *isp_af_ctlr_t

  Type of ISP AF controller handle.

typedef struct isp_awb_controller_t *isp_awb_ctlr_t

  Type of ISP AWB controller handle.

typedef struct isp_ae_controller_t *isp_ae_ctlr_t

  Type of ISP AE controller handle.

typedef struct isp_hist_controller_t *isp_hist_ctlr_t

  Type of ISP HIST controller handle.

typedef bool (*esp_isp_sharpen_callback_t)(isp_proc_handle_t proc, const esp_isp_sharpen_evt_data_t *edata, void *user_data)

  Prototype of ISP sharpen event callback.

  Param proc:

    [in] Processor handle

  Param edata:

    [in] ISP sharpen event data

  Param user_data:

    [in] User registered context, registered when in `esp_isp_register_event_callbacks()`

  Return:

    Whether a high priority task is woken up by this function

### Header File

- components/esp_driver_isp/include/driver/isp_af.h

- This header file can be included with:

  >     #include "driver/isp_af.h"

- This header file is a part of the API provided by the `esp_driver_isp` component. To declare that your component depends on `esp_driver_isp`, add the following to your CMakeLists.txt:

  >     REQUIRES esp_driver_isp

  > or

  >     PRIV_REQUIRES esp_driver_isp

### Functions

esp_err_t esp_isp_new_af_controller(isp_proc_handle_t isp_proc, const esp_isp_af_config_t *af_config, isp_af_ctlr_t *ret_hdl)

  New an ISP AF controller.

  Parameters:

    - isp_proc -- [in] ISP Processor handle

    - af_config -- [in] Pointer to AF config. Refer to `esp_isp_af_config_t`.

    - ret_hdl -- [out] AF controller handle

  Returns:

    - ESP_OK On success

    - ESP_ERR_INVALID_ARG If the combination of arguments is invalid

    - ESP_ERR_INVALID_STATE Invalid state

    - ESP_ERR_NOT_FOUND No free interrupt found with the specified flags

    - ESP_ERR_NO_MEM If out of memory

esp_err_t esp_isp_del_af_controller(isp_af_ctlr_t af_ctrlr)

  Delete an ISP AF controller.

  Parameters:

    af_ctrlr -- [in] AF controller handle

  Returns:

    - ESP_OK On success

    - ESP_ERR_INVALID_ARG If the combination of arguments is invalid.

    - ESP_ERR_INVALID_STATE Driver state is invalid.

esp_err_t esp_isp_af_controller_enable(isp_af_ctlr_t af_ctrlr)

  Enable an ISP AF controller.

  Parameters:

    af_ctrlr -- [in] AF controller handle

  Returns:

    - ESP_OK On success

    - ESP_ERR_INVALID_ARG If the combination of arguments is invalid.

    - ESP_ERR_INVALID_STATE Driver state is invalid.

esp_err_t esp_isp_af_controller_disable(isp_af_ctlr_t af_ctrlr)

  Disable an ISP AF controller.

  Parameters:

    af_ctrlr -- [in] AF controller handle

  Returns:

    - ESP_OK On success

    - ESP_ERR_INVALID_ARG If the combination of arguments is invalid.

    - ESP_ERR_INVALID_STATE Driver state is invalid.

esp_err_t esp_isp_af_controller_get_oneshot_statistics(isp_af_ctlr_t af_ctrlr, int timeout_ms, isp_af_result_t *out_res)

  Trigger AF luminance and definition statistics for one time and get the result.

  Parameters:

    - af_ctrlr -- [in] AF controller handle

    - timeout_ms -- [in] Timeout in millisecond

      - timeout_ms < 0: Won't return until finished

      - timeout_ms = 0: No timeout, trigger one time statistics and return immediately, in this case, the result won't be assigned in this function, but you can get the result in the callback `esp_isp_af_env_detector_evt_cbs_t::on_env_statistics_done`

      - timeout_ms > 0: Wait for specified milliseconds, if not finished, then return timeout error

    - out_res -- [out] AF luminance and definition statistics result, can be NULL if `timeout_ms = 0`

  Returns:

    - ESP_OK On success

    - ESP_ERR_TIMEOUT If the waiting time exceeds the specified timeout.

    - ESP_ERR_INVALID_ARG If the combination of arguments is invalid.

    - ESP_ERR_INVALID_STATE Driver state is invalid.

esp_err_t esp_isp_af_controller_start_continuous_statistics(isp_af_ctlr_t af_ctrlr)

  Start AF continuous statistics of the luminance and definition in the windows.

  Note

  This function is an asynchronous and non-block function, it will start the continuous statistics and return immediately. You have to register the AF callback and get the result from the callback event data.

  Note

  When continuous mode start, AF environment detector will be invalid

  Parameters:

    af_ctrlr -- [in] AF controller handle

  Returns:

    - ESP_OK On success

    - ESP_ERR_INVALID_ARG Null pointer

    - ESP_ERR_INVALID_STATE Driver state is invalid.

esp_err_t esp_isp_af_controller_stop_continuous_statistics(isp_af_ctlr_t af_ctrlr)

  Stop AF continuous statistics of the luminance and definition in the windows.

  Parameters:

    af_ctrlr -- [in] AF controller handle

  Returns:

    - ESP_OK On success

    - ESP_ERR_INVALID_ARG Null pointer

    - ESP_ERR_INVALID_STATE Driver state is invalid.

esp_err_t esp_isp_af_controller_set_env_detector(isp_af_ctlr_t af_ctrlr, const esp_isp_af_env_config_t *env_config)

  Set ISP AF environment detector.

  Note

  When continuous mode start, AF environment detector will be invalid

  Parameters:

    - af_ctrlr -- [in] AF controller handle

    - env_config -- [in] AF Env detector configuration

  Returns:

    - ESP_OK On success

    - ESP_ERR_INVALID_ARG If the combination of arguments is invalid.

    - ESP_ERR_INVALID_STATE Driver state is invalid.

esp_err_t esp_isp_af_controller_set_env_detector_threshold(isp_af_ctlr_t af_ctrlr, int definition_thresh, int luminance_thresh)

  Set ISP AF environment detector detecting threshold.

  Parameters:

    - af_ctrlr -- [in] AF controller handle

    - definition_thresh -- [in] Threshold for definition

    - luminance_thresh -- [in] Threshold for luminance

  Returns:

    - ESP_OK On success

    - ESP_ERR_INVALID_ARG If the combination of arguments is invalid.

    - ESP_ERR_INVALID_STATE Driver state is invalid.

esp_err_t esp_isp_af_env_detector_register_event_callbacks(isp_af_ctlr_t af_ctrlr, const esp_isp_af_env_detector_evt_cbs_t *cbs, void *user_data)

  Register AF environment detector event callbacks.

  Note

  User can deregister a previously registered callback by calling this function and setting the to-be-deregistered callback member in the `cbs` structure to NULL.

  Note

  When CONFIG_ISP_ISR_IRAM_SAFE is enabled, the callback itself and functions called by it should be placed in IRAM. Involved variables (including `user_data`) should be in internal RAM as well.

  Parameters:

    - af_ctrlr -- [in] AF controller handle

    - cbs -- [in] Group of callback functions

    - user_data -- [in] User data, which will be delivered to the callback functions directly

  Returns:

    - ESP_OK: On success

    - ESP_ERR_INVALID_ARG: Invalid arguments

    - ESP_ERR_INVALID_STATE: Driver state is invalid, you shouldn't call this API at this moment

### Structures

struct esp_isp_af_config_t

  AF controller config.

  Public Members

  isp_window_t window[ISP_AF_WINDOW_NUM]

    The sampling windows of AF.

  int edge_thresh

    Edge threshold, definition higher than this value will be counted as a valid pixel for calculating AF result.

  int intr_priority

    The interrupt priority, range 0~3, if set to 0, the driver will try to allocate an interrupt with a relative low priority (1,2,3)

struct esp_isp_af_env_config_t

  AF environment detector config.

  Public Members

  int interval

    Interval between environment detection, in frames. i.e., AF controller will trigger the statistic periodically to detect the environment change.

struct esp_isp_af_env_detector_evt_data_t

  Event data structure.

  Public Members

  isp_af_result_t af_result

    The AF statistics result

struct esp_isp_af_env_detector_evt_cbs_t

  Group of ISP AF Env detector callbacks.

  Note

  These callbacks are all running in an ISR environment.

  Note

  When CONFIG_ISP_ISR_IRAM_SAFE is enabled, the callback itself and functions called by it should be placed in IRAM. Involved variables should be in internal RAM as well.

  Public Members

  esp_isp_af_env_detector_callback_t on_env_statistics_done

    Event callback, invoked when environment sample done.

  esp_isp_af_env_detector_callback_t on_env_change

    Event callback, invoked when environment change happens.

### Type Definitions

typedef bool (*esp_isp_af_env_detector_callback_t)(isp_af_ctlr_t af_ctrlr, const esp_isp_af_env_detector_evt_data_t *edata, void *user_data)

  Prototype of ISP AF Env detector event callback.

  Param af_ctrlr:

    [in] ISP AF controller handle

  Param edata:

    [in] ISP AF Env detector event data

  Param user_data:

    [in] User registered context, registered when in `esp_isp_af_env_detector_register_event_callbacks()`

  Return:

    Whether a high priority task is woken up by this function

### Header File

- components/esp_driver_isp/include/driver/isp_ae.h

- This header file can be included with:

  >     #include "driver/isp_ae.h"

- This header file is a part of the API provided by the `esp_driver_isp` component. To declare that your component depends on `esp_driver_isp`, add the following to your CMakeLists.txt:

  >     REQUIRES esp_driver_isp

  > or

  >     PRIV_REQUIRES esp_driver_isp

### Functions

esp_err_t esp_isp_new_ae_controller(isp_proc_handle_t isp_proc, const esp_isp_ae_config_t *ae_config, isp_ae_ctlr_t *ret_hdl)

  New an ISP AE controller.

  Parameters:

    - isp_proc -- [in] ISP Processor handle

    - ae_config -- [in] Pointer to AE config. Refer to `esp_isp_ae_config_t`.

    - ret_hdl -- [out] AE controller handle

  Returns:

    - ESP_OK On success

    - ESP_ERR_INVALID_ARG If the combination of arguments is invalid

    - ESP_ERR_INVALID_STATE Invalid state

    - ESP_ERR_NOT_FOUND No free interrupt found with the specified flags

    - ESP_ERR_NO_MEM If out of memory

esp_err_t esp_isp_del_ae_controller(isp_ae_ctlr_t ae_ctlr)

  Delete an ISP AE controller.

  Parameters:

    ae_ctlr -- [in] AE controller handle

  Returns:

    - ESP_OK On success

    - ESP_ERR_INVALID_ARG If the combination of arguments is invalid.

    - ESP_ERR_INVALID_STATE Driver state is invalid.

esp_err_t esp_isp_ae_controller_enable(isp_ae_ctlr_t ae_ctlr)

  Enable an ISP AE controller.

  Parameters:

    ae_ctlr -- [in] AE controller handle

  Returns:

    - ESP_OK On success

    - ESP_ERR_INVALID_ARG If the combination of arguments is invalid.

    - ESP_ERR_INVALID_STATE Driver state is invalid.

esp_err_t esp_isp_ae_controller_disable(isp_ae_ctlr_t ae_ctlr)

  Disable an ISP AE controller.

  Parameters:

    ae_ctlr -- [in] AE controller handle

  Returns:

    - ESP_OK On success

    - ESP_ERR_INVALID_ARG If the combination of arguments is invalid.

    - ESP_ERR_INVALID_STATE Driver state is invalid.

esp_err_t esp_isp_ae_controller_get_oneshot_statistics(isp_ae_ctlr_t ae_ctlr, int timeout_ms, isp_ae_result_t *out_res)

  Trigger AE luminance statistics for one time and get the result.

  Parameters:

    - ae_ctlr -- [in] AE controller handle

    - timeout_ms -- [in] Timeout in millisecond

      - timeout_ms < 0: Won't return until finished

      - timeout_ms = 0: No timeout, trigger one time statistics and return immediately, in this case, the result won't be assigned in this function, but you can get the result in the callback `esp_isp_ae_env_detector_evt_cbs_t::on_env_statistics_done`

      - timeout_ms > 0: Wait for specified milliseconds, if not finished, then return timeout error

    - out_res -- [out] AE luminance statistics result, can be NULL if `timeout_ms = 0`

  Returns:

    - ESP_OK On success

    - ESP_ERR_TIMEOUT If the waiting time exceeds the specified timeout.

    - ESP_ERR_INVALID_ARG If the combination of arguments is invalid.

    - ESP_ERR_INVALID_STATE Driver state is invalid.

esp_err_t esp_isp_ae_controller_start_continuous_statistics(isp_ae_ctlr_t ae_ctlr)

  Start AE continuous statistics of the luminance in the windows.

  Note

  This function is an asynchronous and non-block function, it will start the continuous statistics and return immediately. You have to register the AE callback and get the result from the callback event data.

  Note

  When using oneshot statistics, the AE Environment Detector will be temporarily disabled and will automatically recover once the oneshot is complete.

  Parameters:

    ae_ctlr -- [in] AE controller handle

  Returns:

    - ESP_OK On success

    - ESP_ERR_INVALID_ARG Null pointer

    - ESP_ERR_INVALID_STATE Driver state is invalid.

esp_err_t esp_isp_ae_controller_stop_continuous_statistics(isp_ae_ctlr_t ae_ctlr)

  Stop AE continuous statistics of the luminance in the windows.

  Parameters:

    ae_ctlr -- [in] AE controller handle

  Returns:

    - ESP_OK On success

    - ESP_ERR_INVALID_ARG Null pointer

    - ESP_ERR_INVALID_STATE Driver state is invalid.

esp_err_t esp_isp_ae_controller_set_env_detector(isp_ae_ctlr_t ae_ctlr, const esp_isp_ae_env_config_t *env_config)

  Set ISP AE environment detector.

  Parameters:

    - ae_ctlr -- [in] AE controller handle

    - env_config -- [in] AE Env detector configuration

  Returns:

    - ESP_OK On success

    - ESP_ERR_INVALID_ARG If the combination of arguments is invalid.

    - ESP_ERR_INVALID_STATE Driver state is invalid.

esp_err_t esp_isp_ae_controller_set_env_detector_threshold(isp_ae_ctlr_t ae_ctlr, const esp_isp_ae_env_thresh_t *env_thresh)

  Set ISP AE environment detector detecting threshold.

  Parameters:

    - ae_ctlr -- [in] AE controller handle

    - env_thresh -- [in] Luminance thresholds for AE env detector

  Returns:

    - ESP_OK On success

    - ESP_ERR_INVALID_ARG If the combination of arguments is invalid.

    - ESP_ERR_INVALID_STATE Driver state is invalid.

esp_err_t esp_isp_ae_env_detector_register_event_callbacks(isp_ae_ctlr_t ae_ctlr, const esp_isp_ae_env_detector_evt_cbs_t *cbs, void *user_data)

  Register AE Env detector event callbacks.

  Note

  User can deregister a previously registered callback by calling this function and setting the to-be-deregistered callback member in the `cbs` structure to NULL.

  Note

  When CONFIG_ISP_ISR_IRAM_SAEE is enabled, the callback itself and functions called by it should be placed in IRAM. Involved variables (including `user_data`) should be in internal RAM as well.

  Parameters:

    - ae_ctlr -- [in] AE controller handle

    - cbs -- [in] Group of callback functions

    - user_data -- [in] User data, which will be delivered to the callback functions directly

  Returns:

    - ESP_OK: On success

    - ESP_ERR_INVALID_ARG: Invalid arguments

    - ESP_ERR_INVALID_STATE: Driver state is invalid, you shouldn't call this API at this moment

### Structures

struct esp_isp_ae_config_t

  AE controller config.

  Public Members

  isp_ae_sample_point_t sample_point

    The input data source, ISP_AE_SAMPLE_POINT_AFTER_DEMOSAIC: AE input data after demosaic, ISP_AE_SAMPLE_POINT_AFTER_GAMMA: AE input data after gamma.

  isp_window_t window

    The sampling windows of AE.

  int intr_priority

    The interrupt priority, range 0~3, if set to 0, the driver will try to allocate an interrupt with a relative low priority (1,2,3)

struct esp_isp_ae_env_config_t

  AE environment detector config.

  Public Members

  int interval

    Interval between environment detection, in frames. i.e., AE controller will trigger the statistic periodically to detect the environment change.

struct esp_isp_ae_env_thresh_t

  AE environment detector config.

  Public Members

  int low_thresh

    Low threshold for AE environment detector luminance

  int high_thresh

    High threshold for AE environment detector luminance

struct esp_isp_ae_env_detector_evt_data_t

  Event data structure.

  Public Members

  isp_ae_result_t ae_result

    The AE statistics result

struct esp_isp_ae_env_detector_evt_cbs_t

  Group of ISP AE env_detector.

  Note

  These callbacks are all running in an ISR environment.

  Note

  When CONFIG_ISP_ISR_IRAM_SAEE is enabled, the callback itself and functions called by it should be placed in IRAM. Involved variables should be in internal RAM as well.

  Public Members

  esp_isp_ae_env_detector_callback_t on_env_statistics_done

    Event callback, invoked when environment sample done.

  esp_isp_ae_env_detector_callback_t on_env_change

    Event callback, invoked when environment change happens.

### Type Definitions

typedef bool (*esp_isp_ae_env_detector_callback_t)(isp_ae_ctlr_t ae_ctlr, const esp_isp_ae_env_detector_evt_data_t *edata, void *user_data)

  Prototype of ISP AE Env detector event callback.

  Param ae_ctlr:

    [in] ISP AE controller handle

  Param edata:

    [in] ISP AE Env detector event data

  Param user_data:

    [in] User registered context, registered when in `esp_isp_ae_env_detector_register_event_callbacks()`

  Return:

    Whether a high priority task is woken up by this function

### Header File

- components/esp_driver_isp/include/driver/isp_awb.h

- This header file can be included with:

  >     #include "driver/isp_awb.h"

- This header file is a part of the API provided by the `esp_driver_isp` component. To declare that your component depends on `esp_driver_isp`, add the following to your CMakeLists.txt:

  >     REQUIRES esp_driver_isp

  > or

  >     PRIV_REQUIRES esp_driver_isp

### Functions

esp_err_t esp_isp_new_awb_controller(isp_proc_handle_t isp_proc, const esp_isp_awb_config_t *awb_cfg, isp_awb_ctlr_t *ret_hdl)

  New an ISP AWB controller.

  Parameters:

    - isp_proc -- [in] ISP Processor handle

    - awb_cfg -- [in] Pointer to AWB config. Refer to `esp_isp_awb_config_t`.

    - ret_hdl -- [out] AWB controller handle

  Returns:

    - ESP_OK On success

    - ESP_ERR_INVALID_ARG If the combination of arguments is invalid

    - ESP_ERR_INVALID_STATE Invalid state

    - ESP_ERR_NOT_FOUND No free interrupt found with the specified flags

    - ESP_ERR_NO_MEM If out of memory

esp_err_t esp_isp_del_awb_controller(isp_awb_ctlr_t awb_ctlr)

  Delete an ISP AWB controller.

  Parameters:

    awb_ctlr -- [in] AWB controller handle

  Returns:

    - ESP_OK On success

    - ESP_ERR_INVALID_ARG If the combination of arguments is invalid.

    - ESP_ERR_INVALID_STATE Driver state is invalid.

esp_err_t esp_isp_awb_controller_reconfig(isp_awb_ctlr_t awb_ctlr, const esp_isp_awb_config_t *awb_cfg)

  Reconfigure the ISP AWB controller.

  Note

  This function is allowed to be called no matter the awb controller is enabled or not.

  Parameters:

    - awb_ctlr -- [in] AWB controller handle

    - awb_cfg -- [in] Pointer to AWB config. Refer to `esp_isp_awb_config_t`

  Returns:

    - ESP_OK On success

    - ESP_ERR_INVALID_ARG If the combination of arguments is invalid

esp_err_t esp_isp_awb_controller_enable(isp_awb_ctlr_t awb_ctlr)

  Enable an ISP AWB controller.

  Parameters:

    awb_ctlr -- [in] AWB controller handle

  Returns:

    - ESP_OK On success

    - ESP_ERR_INVALID_ARG If the combination of arguments is invalid.

    - ESP_ERR_INVALID_STATE Driver state is invalid.

esp_err_t esp_isp_awb_controller_disable(isp_awb_ctlr_t awb_ctlr)

  Disable an ISP AWB controller.

  Parameters:

    awb_ctlr -- [in] AWB controller handle

  Returns:

    - ESP_OK On success

    - ESP_ERR_INVALID_ARG If the combination of arguments is invalid.

    - ESP_ERR_INVALID_STATE Driver state is invalid.

esp_err_t esp_isp_awb_controller_get_oneshot_statistics(isp_awb_ctlr_t awb_ctlr, int timeout_ms, isp_awb_stat_result_t *out_res)

  Trigger AWB white patch statistics for one time and get the result.

  Parameters:

    - awb_ctlr -- [in] AWB controller handle

    - timeout_ms -- [in] Timeout in millisecond

      - timeout_ms < 0: Won't return until finished

      - timeout_ms = 0: No timeout, trigger one time statistics and return immediately, in this case, the result won't be assigned in this function, but you can get the result in the callback `esp_isp_awb_cbs_t::on_statistics_done`

      - timeout_ms > 0: Wait for specified milliseconds, if not finished, then return timeout error

    - out_res -- [out] AWB white patch statistics result

  Returns:

    - ESP_OK On success

    - ESP_ERR_TIMEOUT Wait for the result timeout

    - ESP_ERR_INVALID_ARG If the combination of arguments is invalid.

    - ESP_ERR_INVALID_STATE Driver state is invalid.

esp_err_t esp_isp_awb_controller_start_continuous_statistics(isp_awb_ctlr_t awb_ctlr)

  Start AWB continuous statistics of the white patch in the window.

  Note

  This function is an asynchronous and non-block function, it will start the continuous statistics and return immediately. You have to register the AWB callback and get the result from the callback event data.

  Parameters:

    awb_ctlr -- [in] AWB controller handle

  Returns:

    - ESP_OK On success

    - ESP_ERR_INVALID_ARG Null pointer

    - ESP_ERR_INVALID_STATE Driver state is invalid.

esp_err_t esp_isp_awb_controller_stop_continuous_statistics(isp_awb_ctlr_t awb_ctlr)

  Stop AWB continuous statistics of the white patch in the window.

  Parameters:

    awb_ctlr -- [in] AWB controller handle

  Returns:

    - ESP_OK On success

    - ESP_ERR_INVALID_ARG Null pointer

    - ESP_ERR_INVALID_STATE Driver state is invalid.

esp_err_t esp_isp_awb_register_event_callbacks(isp_awb_ctlr_t awb_ctlr, const esp_isp_awb_cbs_t *cbs, void *user_data)

  Register AWB event callbacks.

  Note

  User can deregister a previously registered callback by calling this function and setting the to-be-deregistered callback member in the `cbs` structure to NULL.

  Note

  When CONFIG_ISP_ISR_IRAM_SAFE is enabled, the callback itself and functions called by it should be placed in IRAM. Involved variables (including `user_data`) should be in internal RAM as well.

  Parameters:

    - awb_ctlr -- [in] AWB controller handle

    - cbs -- [in] Group of callback functions

    - user_data -- [in] User data, which will be delivered to the callback functions directly

  Returns:

    - ESP_OK: On success

    - ESP_ERR_INVALID_ARG: Invalid arguments

    - ESP_ERR_INVALID_STATE: Driver state is invalid, you shouldn't call this API at this moment

### Structures

struct esp_isp_awb_config_t

  AWB controller config.

  Public Members

  isp_awb_sample_point_t sample_point

    AWB sample point of the ISP pipeline. ISP_AWB_SAMPLE_POINT_BEFORE_CCM: sample before Color Correction Matrix(CCM). ISP_AWB_SAMPLE_POINT_AFTER_CCM: sample after Color Correction Matrix(CCM). If your camera support to set the manual gain to the RGB channels, then you can choose to sample before CCM, and set the gain to the camera registers. If your camera doesn't support the manual gain or don't want to change the camera configuration, then you can choose to sample after CCM, and set the calculated gain to the CCM

  isp_window_t window

    Statistic window of AWB. Suggest to set it at the middle of the image and a little smaller than the whole image. It will be more reliable because the edges of image are easily to be overexposure, the overexposure pixels are almost at maximum luminance, which are not good references to calculate the gain for white balance.

  isp_u32_range_t luminance

    Luminance range of the white patch. Range [0, 255 * 3] Not suggest to set the max value to 255 * 3, because these pixels are too bright, very possible to be overexposure. So the pixels that too bright should not be the reference of the white balance. And the minimum value better to be 0 to allow the white balance work under low luminance environment.

  isp_float_range_t red_green_ratio

    Red to green ratio of the white patch. Range [0, 4.0). The ratio could be as wider as possible, so that all the distorted pixels will be counted for the reference of white balance.

  isp_float_range_t blue_green_ratio

    Blue to green ratio of the white patch. Range [0, 4.0) The ratio could be as wider as possible, so that all the distorted pixels will be counted for the reference of white balance.

  struct esp_isp_awb_config_t::[anonymous] white_patch

    white patch configuration

  int intr_priority

    The interrupt priority, range 0~3, if set to 0, the driver will try to allocate an interrupt with a relative low priority (1,2,3)

struct esp_isp_awb_evt_data_t

  Event data of callbacks.

  Public Members

  isp_awb_stat_result_t awb_result

    The AWB white patch statistics result

struct esp_isp_awb_cbs_t

  Group of ISP AWB callbacks.

  Note

  These callbacks are all running in an ISR environment.

  Note

  When CONFIG_ISP_ISR_IRAM_SAFE is enabled, the callback itself and functions called by it should be placed in IRAM. Involved variables should be in internal RAM as well.

  Public Members

  esp_isp_awb_callback_t on_statistics_done

    Event callback, invoked when white patches statistic done.

### Type Definitions

typedef bool (*esp_isp_awb_callback_t)(isp_awb_ctlr_t awb_ctlr, const esp_isp_awb_evt_data_t *edata, void *user_data)

  Prototype of ISP AWB event callback.

  Param awb_ctlr:

    [in] ISP AWB controller handle

  Param edata:

    [in] ISP AWB event data

  Param user_data:

    [in] User registered context, registered when in `esp_isp_awb_env_detector_register_event_callbacks()`

  Return:

    Whether a high priority task is woken up by this function

### Header File

- components/esp_driver_isp/include/driver/isp_bf.h

- This header file can be included with:

  >     #include "driver/isp_bf.h"

- This header file is a part of the API provided by the `esp_driver_isp` component. To declare that your component depends on `esp_driver_isp`, add the following to your CMakeLists.txt:

  >     REQUIRES esp_driver_isp

  > or

  >     PRIV_REQUIRES esp_driver_isp

### Functions

esp_err_t esp_isp_bf_configure(isp_proc_handle_t proc, const esp_isp_bf_config_t *config)

  ISP BF configuration.

  Note

  After calling this API, BF doesn't take into effect until `esp_isp_bf_enable` is called

  Parameters:

    - proc -- [in] Processor handle

    - config -- [in] BF configurations, set NULL to de-configure the ISP BF

  Returns:

    - ESP_OK On success

    - ESP_ERR_INVALID_STATE Not allowed to be called under current state

    - ESP_ERR_INVALID_ARG If the combination of arguments is invalid

esp_err_t esp_isp_bf_enable(isp_proc_handle_t proc)

  Enable ISP BF function.

  Parameters:

    proc -- [in] Processor handle

  Returns:

    - ESP_OK On success

    - ESP_ERR_INVALID_ARG If the combination of arguments is invalid.

    - ESP_ERR_INVALID_STATE Driver state is invalid.

esp_err_t esp_isp_bf_disable(isp_proc_handle_t proc)

  Disable ISP BF function.

  Parameters:

    proc -- [in] Processor handle

  Returns:

    - ESP_OK On success

    - ESP_ERR_INVALID_ARG If the combination of arguments is invalid.

    - ESP_ERR_INVALID_STATE Driver state is invalid.

### Structures

struct esp_isp_bf_config_t

  ISP BF configurations.

  Public Members

  isp_bf_edge_padding_mode_t padding_mode

    BF edge padding mode.

  uint8_t padding_data

    BF edge padding pixel data.

  uint8_t bf_template[ISP_BF_TEMPLATE_X_NUMS][ISP_BF_TEMPLATE_Y_NUMS]

    BF template data.

  uint8_t denoising_level

    BF denoising level, from 2 to 20, the bigger the better denoising performance, but the worse detailed.

  uint8_t padding_line_tail_valid_start_pixel

    BF edge padding line tail valid start pixel, padding data will only be valid between the valid start pixel and the valid end pixel. Set both the start and end pixel to 0 to make all padding pixel valid.

  uint8_t padding_line_tail_valid_end_pixel

    BF edge padding line tail valid end pixel, padding data will only be valid between the valid start pixel and the valid end pixel. Set both the start and end pixel to 0 to make all padding pixel valid.

### Header File

- components/esp_driver_isp/include/driver/isp_lsc.h

- This header file can be included with:

  >     #include "driver/isp_lsc.h"

- This header file is a part of the API provided by the `esp_driver_isp` component. To declare that your component depends on `esp_driver_isp`, add the following to your CMakeLists.txt:

  >     REQUIRES esp_driver_isp

  > or

  >     PRIV_REQUIRES esp_driver_isp

### Functions

esp_err_t esp_isp_lsc_allocate_gain_array(isp_proc_handle_t isp_proc, esp_isp_lsc_gain_array_t *gain_array, size_t *out_array_size_per_channel)

  Helper function to allocate gain array for LSC.

  Parameters:

    - isp_proc -- [in] Processor handle

    - gain_array -- [in] Gain array to be allocated

    - out_array_size_per_channel -- [out] Array size

  Returns:

    - ESP_OK On success

    - ESP_ERR_INVALID_STATE Not allowed to be called under current state

    - ESP_ERR_INVALID_ARG If the combination of arguments is invalid

    - ESP_ERR_NO_MEM Out of memory

esp_err_t esp_isp_lsc_configure(isp_proc_handle_t isp_proc, const esp_isp_lsc_config_t *config)

  ISP LSC configuration.

  Note

  After calling this API, LSC doesn't take into effect until `esp_isp_lsc_enable` is called

  Parameters:

    - isp_proc -- [in] Processor handle

    - config -- [in] LSC configurations

  Returns:

    - ESP_OK On success

    - ESP_ERR_INVALID_STATE Not allowed to be called under current state

    - ESP_ERR_INVALID_ARG If the combination of arguments is invalid

    - ESP_ERR_NOT_SUPPORTED Not supported

esp_err_t esp_isp_lsc_enable(isp_proc_handle_t isp_proc)

  Enable ISP LSC function.

  Parameters:

    isp_proc -- [in] Processor handle

  Returns:

    - ESP_OK On success

    - ESP_ERR_INVALID_ARG If the combination of arguments is invalid.

    - ESP_ERR_INVALID_STATE Driver state is invalid.

esp_err_t esp_isp_lsc_disable(isp_proc_handle_t isp_proc)

  Disable ISP LSC function.

  Parameters:

    isp_proc -- [in] Processor handle

  Returns:

    - ESP_OK On success

    - ESP_ERR_INVALID_ARG If the combination of arguments is invalid.

    - ESP_ERR_INVALID_STATE Driver state is invalid.

### Structures

struct esp_isp_lsc_gain_array_t

  LSC Gain array.

  Public Members

  isp_lsc_gain_t *gain_r

    Gain for R channel.

  isp_lsc_gain_t *gain_gr

    Gain for GR channel.

  isp_lsc_gain_t *gain_gb

    Gain for GB channel.

  isp_lsc_gain_t *gain_b

    Gain for B channel.

struct esp_isp_lsc_config_t

  ISP LSC configurations.

  Public Members

  esp_isp_lsc_gain_array_t *gain_array

    Gain array.

### Header File

- components/esp_driver_isp/include/driver/isp_ccm.h

- This header file can be included with:

  >     #include "driver/isp_ccm.h"

- This header file is a part of the API provided by the `esp_driver_isp` component. To declare that your component depends on `esp_driver_isp`, add the following to your CMakeLists.txt:

  >     REQUIRES esp_driver_isp

  > or

  >     PRIV_REQUIRES esp_driver_isp

### Functions

esp_err_t esp_isp_ccm_configure(isp_proc_handle_t proc, const esp_isp_ccm_config_t *ccm_cfg)

  ISP Color Correction Matrix (CCM) configuration.

  Note

  This function is allowed to be called before or after `esp_isp_ccm_enable`, but it only takes effect until `esp_isp_ccm_enable` is called

  Parameters:

    - proc -- [in] Processor handle

    - ccm_cfg -- [in] CCM configurations

  Returns:

    - ESP_OK On success

    - ESP_ERR_INVALID_ARG If the combination of arguments is invalid

esp_err_t esp_isp_ccm_enable(isp_proc_handle_t proc)

  Enable ISP CCM function.

  Parameters:

    proc -- [in] Processor handle

  Returns:

    - ESP_OK On success

    - ESP_ERR_INVALID_ARG If the combination of arguments is invalid.

esp_err_t esp_isp_ccm_disable(isp_proc_handle_t proc)

  Disable ISP CCM function.

  Parameters:

    proc -- [in] Processor handle

  Returns:

    - ESP_OK On success

    - ESP_ERR_INVALID_ARG If the combination of arguments is invalid.

### Structures

struct esp_isp_ccm_config_t

  Color Correction Matrix configurations.

  Public Members

  float matrix[ISP_CCM_DIMENSION][ISP_CCM_DIMENSION]

    The color correction matrix in float, range (-4.0, 4.0)

  bool saturation

    Whether to use saturation when the float data in the matrix is out of the range, For example, if one of the matrix data is 5.0, When saturation is true, and final value will be limited to 4.0, and won't rise error When saturation is false, `esp_isp_ccm_configure` will rise ESP_ERR_INVALID_ARG error

### Header File

- components/esp_driver_isp/include/driver/isp_demosaic.h

- This header file can be included with:

  >     #include "driver/isp_demosaic.h"

- This header file is a part of the API provided by the `esp_driver_isp` component. To declare that your component depends on `esp_driver_isp`, add the following to your CMakeLists.txt:

  >     REQUIRES esp_driver_isp

  > or

  >     PRIV_REQUIRES esp_driver_isp

### Functions

esp_err_t esp_isp_demosaic_configure(isp_proc_handle_t proc, const esp_isp_demosaic_config_t *config)

  ISP Demosaic configuration.

  Note

  After calling this API, Demosaic doesn't take into effect until `esp_isp_demosaic_enable` is called

  Parameters:

    - proc -- [in] Processor handle

    - config -- [in] Demosaic configurations, set NULL to de-configure the ISP Demosaic

  Returns:

    - ESP_OK On success

    - ESP_ERR_INVALID_ARG If the combination of arguments is invalid

esp_err_t esp_isp_demosaic_enable(isp_proc_handle_t proc)

  Enable ISP Demosaic function.

  Parameters:

    proc -- [in] Processor handle

  Returns:

    - ESP_OK On success

    - ESP_ERR_INVALID_ARG If the combination of arguments is invalid.

    - ESP_ERR_INVALID_STATE Driver state is invalid.

esp_err_t esp_isp_demosaic_disable(isp_proc_handle_t proc)

  Disable ISP Demosaic function.

  Parameters:

    proc -- [in] Processor handle

  Returns:

    - ESP_OK On success

    - ESP_ERR_INVALID_ARG If the combination of arguments is invalid.

    - ESP_ERR_INVALID_STATE Driver state is invalid.

### Structures

struct esp_isp_demosaic_config_t

  ISP Demosaic configurations.

  Public Members

  isp_demosaic_grad_ratio_t grad_ratio

    Demosaic gradient ratio,

    - gradient_x * grad_ratio < gradient_y, use interpolation results in X direction

    - gradient_y * grad_ratio < gradient_x, use interpolation results in Y direction

    - else use the average results between X and Y

  isp_demosaic_edge_padding_mode_t padding_mode

    Demosaic edge padding mode.

  uint8_t padding_data

    Demosaic edge padding pixel data.

  uint8_t padding_line_tail_valid_start_pixel

    Demosaic edge padding line tail valid start pixel, padding data will only be valid between the valid start pixel and the valid end pixel. Set both the start and end pixel to 0 to make all padding pixel valid.

  uint8_t padding_line_tail_valid_end_pixel

    Demosaic edge padding line tail valid end pixel, padding data will only be valid between the valid start pixel and the valid end pixel. Set both the start and end pixel to 0 to make all padding pixel valid.

### Header File

- components/esp_driver_isp/include/driver/isp_sharpen.h

- This header file can be included with:

  >     #include "driver/isp_sharpen.h"

- This header file is a part of the API provided by the `esp_driver_isp` component. To declare that your component depends on `esp_driver_isp`, add the following to your CMakeLists.txt:

  >     REQUIRES esp_driver_isp

  > or

  >     PRIV_REQUIRES esp_driver_isp

### Functions

esp_err_t esp_isp_sharpen_configure(isp_proc_handle_t proc, const esp_isp_sharpen_config_t *config)

  ISP Sharpen configuration.

  Note

  After calling this API, sharpen doesn't take into effect until `esp_isp_sharpen_enable` is called

  Parameters:

    - proc -- [in] Processor handle

    - config -- [in] Sharpen configurations, set NULL to de-configure the ISP Sharpen

  Returns:

    - ESP_OK On success

    - ESP_ERR_INVALID_ARG If the combination of arguments is invalid

esp_err_t esp_isp_sharpen_enable(isp_proc_handle_t proc)

  Enable ISP Sharpen function.

  Parameters:

    proc -- [in] Processor handle

  Returns:

    - ESP_OK On success

    - ESP_ERR_INVALID_ARG If the combination of arguments is invalid.

    - ESP_ERR_INVALID_STATE Driver state is invalid.

esp_err_t esp_isp_sharpen_disable(isp_proc_handle_t proc)

  Disable ISP Sharpen function.

  Parameters:

    proc -- [in] Processor handle

  Returns:

    - ESP_OK On success

    - ESP_ERR_INVALID_ARG If the combination of arguments is invalid.

    - ESP_ERR_INVALID_STATE Driver state is invalid.

### Structures

struct esp_isp_sharpen_config_t

  ISP Sharpen configurations.

  Public Members

  isp_sharpen_h_freq_coeff_t h_freq_coeff

    High freq pixel sharpeness coeff.

  isp_sharpen_m_freq_coeff m_freq_coeff

    Medium freq pixel sharpeness coeff.

  uint8_t h_thresh

    High threshold, pixel value higher than this threshold will be multiplied by `h_freq_coeff`

  uint8_t l_thresh

    Low threshold, pixel value higher than this threshold but lower than `h_thresh` will be multiplied by `m_freq_coeff`. Pixel value lower than this threshold will be set to 0.

  isp_sharpen_edge_padding_mode_t padding_mode

    Sharpen edge padding mode.

  uint8_t padding_data

    Sharpen edge padding pixel data.

  uint8_t sharpen_template[ISP_SHARPEN_TEMPLATE_X_NUMS][ISP_SHARPEN_TEMPLATE_Y_NUMS]

    Sharpen template data.

  uint8_t padding_line_tail_valid_start_pixel

    Sharpen edge padding line tail valid start pixel, padding data will only be valid between the valid start pixel and the valid end pixel. Set both the start and end pixel to 0 to make all padding pixel valid.

  uint8_t padding_line_tail_valid_end_pixel

    Sharpen edge padding line tail valid end pixel, padding data will only be valid between the valid start pixel and the valid end pixel. Set both the start and end pixel to 0 to make all padding pixel valid.

### Header File

- components/esp_driver_isp/include/driver/isp_gamma.h

- This header file can be included with:

  >     #include "driver/isp_gamma.h"

- This header file is a part of the API provided by the `esp_driver_isp` component. To declare that your component depends on `esp_driver_isp`, add the following to your CMakeLists.txt:

  >     REQUIRES esp_driver_isp

  > or

  >     PRIV_REQUIRES esp_driver_isp

### Functions

esp_err_t esp_isp_gamma_configure(isp_proc_handle_t proc, color_component_t component, const isp_gamma_curve_points_t *pts)

  ISP gamma Correction configuration.

  Note

  This function is allowed to be called before or after esp_isp_gamma_enable(), but it only takes effect until esp_isp_gamma_enable() is called

  Parameters:

    - proc -- [in] Processor handle

    - component -- [in] One of the R/G/B components, color_component_t

    - pts -- [in]

      Group of points that describe the desired gamma correction curve;

      Passing in NULL to reset to default parameters (no correction)

  Returns:

    - ESP_OK On success

    - ESP_ERR_INVALID_ARG If the combination of arguments is invalid

esp_err_t esp_isp_gamma_enable(isp_proc_handle_t proc)

  Enable ISP gamma function.

  Parameters:

    proc -- [in] Processor handle

  Returns:

    - ESP_OK On success

    - ESP_ERR_INVALID_ARG If the combination of arguments is invalid.

esp_err_t esp_isp_gamma_disable(isp_proc_handle_t proc)

  Disable ISP gamma function.

  Parameters:

    proc -- [in] Processor handle

  Returns:

    - ESP_OK On success

    - ESP_ERR_INVALID_ARG If the combination of arguments is invalid.

esp_err_t esp_isp_gamma_fill_curve_points(uint32_t (*gamma_correction_operator)(uint32_t), isp_gamma_curve_points_t *pts)

  Helper function to fill the isp_gamma_curve_points_t structure, giving the mathematical function of the desired gamma correction curve.

  Note

  The raw values are sampled with equal spacing

  Parameters:

    - gamma_correction_operator -- [in]

      The desired gamma correction curve y = f(x).

      x is the raw value, in [0, 256]; y is the gamma-corrected value, in [0, 256];

      y can be equal to 256 only if x = 256. For any other x value, y should be always less than 256.

    - pts -- [out] Pointer to the to-be-filled isp_gamma_curve_points_t structure

  Returns:

    - ESP_OK On success

    - ESP_ERR_INVALID_ARG If the combination of arguments is invalid.

### Header File

- components/esp_driver_isp/include/driver/isp_hist.h

- This header file can be included with:

  >     #include "driver/isp_hist.h"

- This header file is a part of the API provided by the `esp_driver_isp` component. To declare that your component depends on `esp_driver_isp`, add the following to your CMakeLists.txt:

  >     REQUIRES esp_driver_isp

  > or

  >     PRIV_REQUIRES esp_driver_isp

### Functions

esp_err_t esp_isp_new_hist_controller(isp_proc_handle_t isp_proc, const esp_isp_hist_config_t *hist_cfg, isp_hist_ctlr_t *ret_hdl)

  New an ISP hist controller.

  Parameters:

    - isp_proc -- [in] ISP Processor handle

    - hist_cfg -- [in] Pointer to hist config. Refer to `esp_isp_hist_config_t`.

    - ret_hdl -- [out] hist controller handle

  Returns:

    - ESP_OK On success

    - ESP_ERR_INVALID_ARG If the combination of arguments is invalid

    - ESP_ERR_INVALID_STATE Invalid state

    - ESP_ERR_NOT_FOUND No free interrupt found with the specified flags

    - ESP_ERR_NO_MEM If out of memory

esp_err_t esp_isp_del_hist_controller(isp_hist_ctlr_t hist_ctlr)

  Delete an ISP hist controller.

  Parameters:

    hist_ctlr -- [in] hist controller handle

  Returns:

    - ESP_OK On success

    - ESP_ERR_INVALID_ARG If the combination of arguments is invalid.

    - ESP_ERR_INVALID_STATE Driver state is invalid.

esp_err_t esp_isp_hist_controller_enable(isp_hist_ctlr_t hist_ctlr)

  Enable an ISP hist controller.

  Parameters:

    hist_ctlr -- [in] hist controller handle

  Returns:

    - ESP_OK On success

    - ESP_ERR_INVALID_ARG If the combination of arguments is invalid.

    - ESP_ERR_INVALID_STATE Driver state is invalid.

esp_err_t esp_isp_hist_controller_disable(isp_hist_ctlr_t hist_ctlr)

  Disable an ISP hist controller.

  Parameters:

    hist_ctlr -- [in] hist controller handle

  Returns:

    - ESP_OK On success

    - ESP_ERR_INVALID_ARG If the combination of arguments is invalid.

    - ESP_ERR_INVALID_STATE Driver state is invalid.

esp_err_t esp_isp_hist_controller_get_oneshot_statistics(isp_hist_ctlr_t hist_ctlr, int timeout_ms, isp_hist_result_t *out_res)

  Trigger hist reference statistics for one time and get the result.

  Parameters:

    - hist_ctlr -- [in] hist controller handle

    - timeout_ms -- [in] Timeout in millisecond

      - timeout_ms < 0: Won't return until finished

      - timeout_ms = 0: No timeout, trigger one time statistics and return immediately, in this case, the result won't be assigned in this function, but you can get the result in the callback `esp_isp_hist_cbs_t::on_statistics_done`

      - timeout_ms > 0: Wait for specified milliseconds, if not finished, then return timeout error

    - out_res -- [out] hist reference statistics result

  Returns:

    - ESP_OK On success

    - ESP_ERR_TIMEOUT Wait for the result timeout

    - ESP_ERR_INVALID_ARG If the combination of arguments is invalid.

    - ESP_ERR_INVALID_STATE Driver state is invalid.

esp_err_t esp_isp_hist_controller_start_continuous_statistics(isp_hist_ctlr_t hist_ctlr)

  Start hist continuous statistics of the reference in the window.

  Note

  This function is an asynchronous and non-block function, it will start the continuous statistics and return immediately. You have to register the hist callback and get the result from the callback event data.

  Parameters:

    hist_ctlr -- [in] hist controller handle

  Returns:

    - ESP_OK On success

    - ESP_ERR_INVALID_ARG Null pointer

    - ESP_ERR_INVALID_STATE Driver state is invalid.

esp_err_t esp_isp_hist_controller_stop_continuous_statistics(isp_hist_ctlr_t hist_ctlr)

  Stop hist continuous statistics of the reference in the window.

  Parameters:

    hist_ctlr -- [in] hist controller handle

  Returns:

    - ESP_OK On success

    - ESP_ERR_INVALID_ARG Null pointer

    - ESP_ERR_INVALID_STATE Driver state is invalid.

esp_err_t esp_isp_hist_register_event_callbacks(isp_hist_ctlr_t hist_ctlr, const esp_isp_hist_cbs_t *cbs, void *user_data)

  Register hist event callbacks.

  Note

  User can deregister a previously registered callback by calling this function and setting the to-be-deregistered callback member in the `cbs` structure to NULL.

  Note

  When CONFIG_ISP_ISR_IRAM_SAFE is enabled, the callback itself and functions called by it should be placed in IRAM. Involved variables (including `user_data`) should be in internal RAM as well.

  Parameters:

    - hist_ctlr -- [in] hist controller handle

    - cbs -- [in] Group of callback functions

    - user_data -- [in] User data, which will be delivered to the callback functions directly

  Returns:

    - ESP_OK: On success

    - ESP_ERR_INVALID_ARG: Invalid arguments

    - ESP_ERR_INVALID_STATE: Driver state is invalid, you shouldn't call this API at this moment

### Structures

struct esp_isp_hist_config_t

  Hist controller config.

  Public Members

  isp_window_t window

    The sampling window of histogram, see `isp_window_t`

  isp_hist_sampling_mode_t hist_mode

    ISP histogram sampling mode

  isp_hist_rgb_coefficient_t rgb_coefficient

    RGB coefficients, adjust the sensitivity to red, geen, and blue colors in the image, only effect when hist_mode is ISP_HIST_SAMPLING_RGB, the sum of all coefficients decimal should be 256

  isp_hist_weight_t window_weight[ISP_HIST_BLOCK_X_NUM * ISP_HIST_BLOCK_Y_NUM]

    Weights of histogram's each subwindows, the sum of all subwindows's weight decimal should be 256

  uint32_t segment_threshold[ISP_HIST_INTERVAL_NUMS]

    Threshold to segment the histogram into intervals, range 0~255

struct esp_isp_hist_evt_data_t

  Event data of callbacks.

  Public Members

  isp_hist_result_t hist_result

    The histogram reference statistics result

struct esp_isp_hist_cbs_t

  Group of ISP hist callbacks.

  Note

  These callbacks are all running in an ISR environment.

  Note

  When CONFIG_ISP_ISR_IRAM_SAFE is enabled, the callback itself and functions called by it should be placed in IRAM. Involved variables should be in internal RAM as well.

  Public Members

  esp_isp_hist_callback_t on_statistics_done

    Event callback, invoked when histogram statistic done.

### Type Definitions

typedef bool (*esp_isp_hist_callback_t)(isp_hist_ctlr_t hist_ctlr, const esp_isp_hist_evt_data_t *edata, void *user_data)

  Prototype of ISP hist event callback.

  Param hist_ctlr:

    [in] ISP hist controller handle

  Param edata:

    [in] ISP hist event data

  Param user_data:

    [in] User registered context, registered when in `esp_isp_hist_register_event_callbacks()`

  Return:

    Whether a high priority task is woken up by this function

### Header File

- components/esp_driver_isp/include/driver/isp_color.h

- This header file can be included with:

  >     #include "driver/isp_color.h"

- This header file is a part of the API provided by the `esp_driver_isp` component. To declare that your component depends on `esp_driver_isp`, add the following to your CMakeLists.txt:

  >     REQUIRES esp_driver_isp

  > or

  >     PRIV_REQUIRES esp_driver_isp

### Functions

esp_err_t esp_isp_color_configure(isp_proc_handle_t proc, const esp_isp_color_config_t *config)

  ISP Color configuration.

  Note

  After calling this API, Color doesn't take into effect until `esp_isp_color_enable` is called

  Note

  API is ISR available

  Parameters:

    - proc -- [in] Processor handle

    - config -- [in] Color configurations, set NULL to de-configure the ISP Color

  Returns:

    - ESP_OK On success

    - ESP_ERR_INVALID_ARG If the combination of arguments is invalid

esp_err_t esp_isp_color_enable(isp_proc_handle_t proc)

  Enable ISP color function.

  Parameters:

    proc -- [in] Processor handle

  Returns:

    - ESP_OK On success

    - ESP_ERR_INVALID_ARG If the combination of arguments is invalid.

    - ESP_ERR_INVALID_STATE Driver state is invalid.

esp_err_t esp_isp_color_disable(isp_proc_handle_t proc)

  Disable ISP color function.

  Parameters:

    proc -- [in] Processor handle

  Returns:

    - ESP_OK On success

    - ESP_ERR_INVALID_ARG If the combination of arguments is invalid.

    - ESP_ERR_INVALID_STATE Driver state is invalid.

### Structures

struct esp_isp_color_config_t

  ISP color configurations.

  Public Members

  isp_color_contrast_t color_contrast

    The color contrast value, defines the contrast level of the image, which controls the difference in luminance between the lightest and darkest parts of the image Range 0 ~ 1, decimal value should be 0~127, default 1

  isp_color_saturation_t color_saturation

    The color saturation value, controls the intensity of colors in the image, affecting how vivid or muted the colors appear. Range 0 ~ 1, decimal value should be 0~127, default 1

  uint32_t color_hue

    The color hue value, based on the color wheel. 0 degrees represents red, 120 degrees represents green, and 240 degrees represents blue. 360 degrees overlaps with 0 degrees Range 0 ~ 360, default 0.

  int color_brightness

    The color brightness value. Range -128 ~ 127, default 0. Negative range (-128 to -1): Decreases brightness, the smaller the value, the darker the image. Zero (0): Maintains the original brightness, without adjusting the image's brightness. Positive range (1 to 127): Increases brightness, the larger the value, the brighter the image.

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