BGRToYCbCr420

Converts a BGR image to the YCbCr image with 4:2:0 sampling format.

Syntax

IppStatus ippiBGRToYCbCr420_8u_C3P3R(const Ipp8u* pSrc, int srcStep, Ipp8u* pDst[3], int dstStep[3], IppiSize roiSize);

IppStatus ippiBGRToYCbCr420_8u_AC4P3R(const Ipp8u* pSrc, int srcStep, Ipp8u* pDst[3], int dstStep[3], IppiSize roiSize);

Parameters

pSrc	Pointer to the source image ROI.
srcStep	Distance in bytes between starts of consecutive lines in the source image.
pDst	An array of pointers to ROI in separate planes of the destination image.
dstStep	An array of distances in bytes between starts of consecutive lines in the destination image planes.
roiSize	Size of the source and destination ROI in pixels.

Description

The function ippiBGRToYCbCr420 is declared in the ippcc.h file. It operates with ROI (see Regions of Interest in Intel IPP).

This function converts a three- or four-channel gamma-corrected B'G'R' image pSrc to the planar Y'Cb'Cr' image pDst according to the same formulas as the function ippiRGBToYCbCr does. The difference is that ippiBGRToYCbCr420 uses 4:2:0 sampling format (see Table “Planar Image Formats” for more details).

roiSize.width and roiSize.height should be multiples of 2. If not the function reduces their original values to the nearest multiples of 2, performs operation, and returns warning message.

Return Values

ippStsNoErr	Indicates no error. Any other value indicates an error or a warning.
ippStsNullPtrErr	Indicates an error condition if pSrc or pDst is NULL.
ippStsSizeErr	Indicates an error condition if roiSize.width is less than 2 or roiSize.height is less than 2.
ippStsDoubleSize	Indicates a warning if roiSize has a field that is not a multiple of 2.