Intel® Integrated Performance Primitives Developer Guide and Reference

ID 790148
Date 11/07/2023
Public

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Document Table of Contents

YCrCb422ToRGB, YCrCb422ToBGR

Convert 16-bit per pixel YCrCb image to 24 or 32-bit per pixel RGB or BGR image.

Syntax

Case 1: Operation on pixel-order data

IppStatus ippiYCrCb422ToRGB_8u_C2C3R(const Ipp8u* pSrc, int srcStep, Ipp8u* pDst, int dstStep, IppiSize roiSize);

IppStatus ippiYCrCb422ToRGB_8u_C2C4R(const Ipp8u* pSrc, int srcStep, Ipp8u* pDst, int dstStep, IppiSize roiSize, Ipp8u aval);

IppStatus ippiYCrCb422ToBGR_8u_C2C3R(const Ipp8u* pSrc, int srcStep, Ipp8u* pDst, int dstStep, IppiSize roiSize);

IppStatus ippiYCrCb422ToBGR_8u_C2C4R(const Ipp8u* pSrc, int srcStep, Ipp8u* pDst, int dstStep, IppiSize roiSize, Ipp8u aval);

Case 2: Conversion from pixel-order to planar data

IppStatus ippiYCrCb422ToRGB_8u_C2P3R(const Ipp8u* pSrc, int srcStep, Ipp8u* pDst[3], int dstStep, 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

Pointer to the source image ROI for pixel-order image. An array of pointers to ROI in each separate source plane for planar images.

srcStep

Distance, in bytes, between the starting points of consecutive lines in the source image.

pDst

Pointer to the ROI in the destination pixel-order image. An array of pointers to ROI in each plane of the destination planar image.

dstStep

Distance, in bytes, between the starting points of consecutive lines in the destination image.

roiSize

Size of the source and destination ROI in pixels.

aval

Constant value to create the fourth channel.

Description

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

This function converts the Y'Cr'Cb' image pSrc, packed in 4:2:2 sampling format (see Table “Pixel-Order Image Formats” and Table “Planar Image Formats” for more details) to the 24-bit gamma-corrected R'G'B' or B'G'R' image pDst according to the same formulas as the function ippiYCbCrToRGBdoes. The output R'G'B' values are saturated to the range [0..255]. Y'Cr'Cb' image with 4:2:2 sampling is also known as YVYU format.

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.

Example

The code example below demonstrates how to use the ippiYCrCb422ToRGB_8u_C2C4R function.

    #define WIDTH 2
    #define HEIGHT 2

    Ipp8u pSrc[WIDTH * HEIGHT * 2] =
    {
        236,50,236,80,
        236,50,236,80,
    };
    Ipp8u pDstRGB[(WIDTH * HEIGHT) * 4];
    int srcStep = WIDTH * 2, dstStep  = WIDTH * 4;
    IppiSize roiSize = {WIDTH, HEIGHT};
    Ipp8u alphaValue = 0xFF;
    IppStatus status = ippiYCrCb422ToRGB_8u_C2C4R(pSrc, srcStep, pDstRGB, dstStep, roiSize, alphaValue);
    if ( status == ippStsNoErr) 
        printf("\n *************  passed ****************\n");
    else 
        printf("\n *************  failed ****************\n");