YCbCrToBGR_709CSC
Converts a YCbCr image to the BGR (ITU-R BT.709 CSC) color model.
This function converts a planar Y'Cb'Cr' image into a three-or four-channel gamma-corrected B'G'R' image for digital component video signals compliant with ITU-R BT.709 Recommendation [ITU709] for computer system consideration (CSC). The conversion is performed according to the following formulas [Jack01]:
The output R'G'B' values are saturated to the range [0, 255].
The fourth channel is created by setting channel values to the constant value aval.
The function interface declaration is as follows:
HmppResult HMPPI_YCbCrToBGR_709CSC_8u_P3C3R(const uint8_t *src[3], int32_t srcStep, uint8_t* dst, int32_t dstStep, HmppiSize roiSize);
HmppResult HMPPI_YCbCrToBGR_709CSC_8u_P3C4R(const uint8_t *src[3], int32_t srcStep, uint8_t* dst, int32_t dstStep, HmppiSize roiSize, uint8_t aVal);
Parameters
Parameter |
Description |
Value Range |
Input/Output |
|---|---|---|---|
src |
Pointer to the source image. An array of pointers to the color planes of the source planar image. |
The value cannot be NULL. |
Input |
srcStep |
Distance between starts of consecutive lines in the source image, in bytes |
The value must be zero or a positive integer. |
Input |
dst |
Pointer to the destination image ROI. An array of pointers to the color planes of the destination planar image. |
The value cannot be NULL. |
Output |
dstStep |
Distance between starts of consecutive lines in the destination image, in bytes |
The value must be zero or a positive integer. |
Input |
roiSize |
Size of the ROI of the source and destination images, in pixels |
roiSize.width ∈ (0, INT_MAX], roiSize.height ∈ (0, INT_MAX] |
Input |
aval |
Constant value to create the fourth channel |
The value must be zero or a positive integer. |
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 is NULL. |
HMPP_STS_SIZE_ERR |
The value of roiSize is 0 or negative. |
HMPP_STS_STEP_ERR |
The value of srcStep is zero or negative. |
HMPP_STS_ROI_ERR |
roiSize.width x Number of channels x Number of bytes occupied by the data type > Step |
Example
#define SRC_BUFFER_SIZE_T 90
#define DST_BUFFER_SIZE_T 90
void TestExample_YCbCrToBGR_709CSC()
{
HmppiSize roi = { 4, 4 };
const uint8_t src1[SRC_BUFFER_SIZE_T] = {
11, 22, 33, 44, 55, 66, 77, 88, 22, 88, 77, 66, 55, 44, 33,
11, 22, 33, 44, 55, 66, 77, 88, 22, 88, 77, 66, 55, 44, 33,
11, 22, 33, 44, 55, 66, 77, 88, 22, 88, 77, 66, 55, 44, 33,
11, 22, 33, 44, 55, 66, 77, 88, 22, 88, 77, 66, 55, 44, 33,
11, 22, 33, 44, 55, 66, 77, 88, 22, 88, 77, 66, 55, 44, 33,
11, 22, 33, 44, 55, 66, 77, 88, 22, 88, 77, 66, 55, 44, 33
};
const uint8_t src2[SRC_BUFFER_SIZE_T] = {
11, 22, 33, 44, 55, 66, 77, 88, 22, 88, 77, 66, 55, 44, 33,
21, 23, 33, 44, 55, 66, 77, 88, 22, 88, 77, 66, 55, 44, 33,
31, 24, 33, 44, 55, 66, 77, 88, 22, 88, 77, 66, 55, 44, 33,
41, 25, 33, 44, 55, 66, 77, 88, 22, 88, 77, 66, 55, 44, 33,
51, 26, 33, 44, 55, 66, 77, 88, 22, 88, 77, 66, 55, 44, 33,
61, 27, 33, 44, 55, 66, 77, 88, 22, 88, 77, 66, 55, 44, 33
};
const uint8_t src3[SRC_BUFFER_SIZE_T] = {
11, 12, 33, 44, 55, 66, 77, 88, 22, 88, 77, 66, 55, 44, 33,
12, 22, 33, 44, 55, 66, 77, 88, 22, 88, 77, 66, 55, 44, 33,
13, 32, 33, 44, 55, 66, 77, 88, 22, 88, 77, 66, 55, 44, 33,
14, 42, 33, 44, 55, 66, 77, 88, 22, 88, 77, 66, 55, 44, 33,
15, 52, 33, 44, 55, 66, 77, 88, 22, 88, 77, 66, 55, 44, 33,
16, 62, 33, 44, 55, 66, 77, 88, 22, 88, 77, 66, 55, 44, 33
};
const uint8_t *src[3] = {src1, src2, src3};
int32_t srcStep = 20 * sizeof(uint8_t);
int32_t dstStep = 20 * sizeof(uint8_t);;
uint8_t dst[DST_BUFFER_SIZE_T] = {0};
uint8_t aval = 254;
HmppResult result = HMPPI_YCbCrToBGR_709CSC_8u_P3C4R(src, srcStep, dst, dstStep, roi, aval);
printf("result = %d \ndst = ", result);
if (result != HMPP_STS_NO_ERR) {
printf("result error: %d\n", result);
}
int32_t dstWidth = dstStep / sizeof(uint8_t);
for(int32_t i = 0; i < DST_BUFFER_SIZE_T; i++){
if (i % dstWidth == 0) {
printf("\n");
}
printf("%3d ",dst[i]);
}
printf("\n");
}
int main()
{
TestExample_YCbCrToBGR_709CSC();
return 0;
}
Output:
result = 0 dst = 0 82 0 254 0 92 0 254 0 91 0 254 0 95 0 254 0 0 0 0 0 105 0 254 0 109 0 254 0 114 12 254 0 86 0 254 0 0 0 0 0 109 0 254 0 105 0 254 0 100 0 254 0 95 0 254 0 0 0 0 0 71 0 254 0 69 0 254 0 91 0 254 0 95 0 254 0 0 0 0 0 0 0 0 0 0 0 0 0 0