Intel® Integrated Performance Primitives (Intel® IPP) Developer Guide and Reference

ID 790148
Date 10/31/2024
Public
Document Table of Contents

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.