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_C3P2R(const Ipp8u* pRGB, int rgbStep, Ipp8u* pY, int yStep, Ipp8u* pCbCr, int cbCrStep, IppiSize roiSize);

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

IppStatus ippiBGRToYCbCr420_8u_AC4P2R(const Ipp8u* pRGB, int rgbStep, Ipp8u* pY, int yStep, Ipp8u* pCbCr, int cbCrStep, IppiSize roiSize);

Include Files

ippcc.h

Domain Dependencies

Headers: ippcore.h, ippvm.h, ipps.h, ippi.h

Libraries: ippcore.lib, ippvm.lib, ipps.lib, ippi.lib

Parameters

pSrc, pRGB	Pointer to the source image ROI.
pY	Pointer to the image Y plane.
srcStep, rgbStep	Distance, in bytes, between the starting points of consecutive lines in the source image.
yStep	Distance, in bytes, between the starting points of consecutive lines in the image Y plane.
pDst, pCbCr	An array of pointers to ROI in separate planes of the destination image.
dstStep, cbCrStep	An array of distances, in bytes, between the starting points of consecutive lines in the destination image planes.
roiSize	Size of the source and destination ROI in pixels.

Description

This function operates with ROI (see Regions of Interest in Intel IPP).

This function converts a three- or four-channel gamma-corrected B'G'R' image to the planar Y'Cb'Cr' image 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 ( pRGB) or pDst ( pCbCr) 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.