RGBToYCrCb420

Converts an RGB image to the YCrCb image with 4:2:0 sampling format.

Syntax

IppStatus ippiRGBToYCrCb420_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	Array of pointers to ROI in separate planes of the destination image.
dstStep	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 ippiRGBToYCrCb420 is declared in the ippcc.h file. It operates with ROI (see Regions of Interest in Intel IPP).

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

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 the operation, and returns a 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 has a field with a zero or negative value.
ippStsDoubleSize	Indicates a warning if roiSize has a field that is not a multiple of 2.