YCbCrI420ToRGB24

Converts a YCbCrI image to the RGB or BGR format. The formulas are as follows:

$\text{[math]}$ ,

$\text{[math]}$ . clamp indicates that the value is limited within [0, 255].

The function interface declaration is as follows:

Conversion from YCbCrI420 to RGB24:
HmppResult HMPPI_YCbCrI420ToRGB24_8u(const uint8_t *src, uint8_t *dst, int32_t width, int32_t height);
Conversion from YCbCrI420 to BGR24:
HmppResult HMPPI_YCbCrI420ToBGR24_8u(const uint8_t *src, uint8_t *dst, int32_t width, int32_t height);

Parameters

Parameter	Description	Value Range	Input/Output
src	Pointer to the source vector	The value cannot be NULL.	Input
dst	Pointer to the destination vector	The value cannot be NULL.	Output
width	Image width (in pixels)	(0, INT_MAX]. The value is an integer multiple of 2.	Input
height	Image height (in pixels)	(0, INT_MAX]. The value is an integer multiple of 2.	Input

Return Value

Success: HMPP_STS_NO_ERR
Failure: An error code is returned.

Error Codes

Error Code	Description
HMPP_STS_NULL_PTR_ERR	The value of src or dst is NULL.
HMPP_STS_SIZE_ERR	The value of width or height is less than or equal to 0.
HMPP_STS_DOUBLE_SIZE_ERR	The value of width or height is not a multiple of 2.

Example

#define SRC_BUFFER_SIZE_T 6
#define DST_BUFFER_SIZE_T 12

int YcbcrToRgbExample(){
    int32_t i;
    uint8_t dst[DST_BUFFER_SIZE_T] = {0};
    uint8_t src[SRC_BUFFER_SIZE_T] = {0, 255, 5, 34, 122, 78};
    HmppResult result = HMPPI_YCbCrI420ToRGB24_8u(src, dst, 2, 2);
    printf("result = %d \ndst =", result);
    for (i = 0; i < DST_BUFFER_SIZE_T; i++) {
        printf(" %d  ", dst[i]);
    }
    return 0;
}

Output:

result = 0
dst = 0   24   0   199   255   255   0   30   0   0   64   9

Parent topic: Image Conversion