hi_stitching_gain_param

Function

Defines the gain compensation parameters.

Definition

typedef struct {
    hi_stitching_histogram_type hist_type;
    hi_stitching_gain_type gain_type;
    hi_void *user_data;
    hi_s32 (*calulate_gain_callback)(
    hi_void *user_data,
    hi_void *hist_config,
    hi_u32 hist_count,
    hi_void *gain,
    hi_u32 gain_size);
} hi_stitching_gain_param;

For details about basic data types hi_s32, hi_u32, and hi_void, see Basic Data Types.

Members

Member	Description
hist_type	Histogram statistics type. For details, see hi_stitching_histogram_type.
gain_type	Gain compensation type. For details, see hi_stitching_gain_type.
user_data	User-defined data.
calulate_gain_callback	Callback function pointer. If gain_type is set to GAIN_LUT or GAIN_VALUE, the callback function pointer must be configured. The parameters in the callback function are described as follows: user_data The API assigns the user-defined data (hi_stitching_gain_param.user_data) to user_data in the callback function. hist_config The hist_config parameter in the callback function is internally managed by the system. You can obtain the histogram information by using this parameter after delivering a surround-view stitching task and before releasing the internal surround-view stitching resources. The information contains only the Y component data but not the UV component data. If hist_type (the histogram statistics type) is OVERLAP_HISTOGRAM or GLOBAL_HISTOGRAM, the data type is hi_stitching_histogram_param. If hist_type is OVERLAP_MEAN_VALUE, the data type is hi_stitching_mean_param. If hist_type is MEAN_Y_VALUE, this parameter indicates the Y-component average value of the pixels of each input image. The data type is UINT32. hist_count Indicates the number of hi_stitching_histogram_param structure objects. If hist_type is OVERLAP_HISTOGRAM or OVERLAP_MEAN_VALUE, the value of hist_count is fixed at 8. If hist_type is GLOBAL_HISTOGRAM, the value of hist_count is fixed at 4. If hist_type is MEAN_Y_VALUE, the value of hist_count is fixed at 4. gain gain parameter in the callback function. If gain_type is GAIN_LUT, you need to convert it into a hi_vpc_lut_remap structure array. The array length is 4. hi_vpc_lut_remap* lutRemap = (hi_vpc_lut_remap)gain If gain_type* is GAIN_VALUE, you need to convert it into UINT32. The array length is 4. In this case, hist_type must be MEAN_Y_VALUE. gain_size If gain_type is GAIN_LUT, gain_size (indicating the length) of the hi_vpc_lut_remap structure array is 4. If gain_type is GAIN_VALUE, gain_size is 4.

Parent topic: VPC Image Processing