BGRToYCbCr422

Converts a BGR image to 4:2:2 YCbCr color model.

Syntax

IppStatus ippiBGRToYCbCr422_JPEG_8u_C3P3R(const Ipp8u* pSrc, int srcStep, Ipp8u* pDst[3], int dstStep[3], IppiSize roiSize);

IppStatus ippiBGRToYCbCr422_JPEG_8u_C4P3R(const Ipp8u* pSrc, int srcStep, Ipp8u* pDst[3], int dstStep[3], IppiSize roiSize);

pSrc	Pointer to the source image ROI for pixel-order data. Array of pointers to the source ROI in each plane for planar image.
srcStep	Distance in bytes between starts of consecutive lines in the source image.
pDst	Array of pointers to the ROI in each plane of the destination image.
dstStep	Array of distance values in bytes between starts of consecutive lines in each planes of the destination image.
roiSize	Size of the source and destination ROI in pixels.

The function ippiBGRToYCbCr422_JPEG is declared in the ippj.h file. It operates with ROI (see Regions of Interest in Intel IPP).

This function converts a BGR image to the YCbCr color model and stores results in pDst packed in 4:2:2 sampling format (see Figure “Different JPEG Sampling Formats” for more details).

The function performs color conversion using the following formulas:

Y = 0.299*R + 0.587*G + 0.114*B

Cb = -0.16874*R - 0.33126*G + 0.5*B + 128

Cr = 0.5*R - 0.41869*G - 0.08131*B + 128

ippStsNoErr	Indicates no error.
ippStsNullPtrErr	Indicates an error condition if any of the specified pointers is NULL.
ippStsSizeErr	Indicates an error condition if roiSize has a field with zero or negative value.
ippStsStepErr	Indicates an error condition if srcStep or dstStep has a zero or negative value.