Intel® Integrated Performance Primitives Developer Guide and Reference

ID 790148
Date 11/07/2023
Public

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Document Table of Contents

YCbCrToRGB

Converts a YCbCr image to the RGB color model.

Syntax

Case 1: Operation on pixel-order data

IppStatus ippiYCbCrToRGB_<mod>(const Ipp8u* pSrc, int srcStep, Ipp8u* pDst, int dstStep, IppiSize roiSize);

Supported values for mod:

8u_C3R 8u_AC4R

Case 2: Operation on planar data

IppStatus ippiYCbCrToRGB_8u_P3R(const Ipp8u* pSrc[3], int srcStep, Ipp8u* pDst[3], int dstStep, IppiSize roiSize);

IppStatus ippiYCbCrToRGB_8u_P3C3R(const Ipp8u* pSrc[3], int srcStep, Ipp8u* pDst, int dstStep, IppiSize roiSize);

Case 3: Conversion from planar to pixel-order data

IppStatus ippiYCbCrToRGB_8u_P3C4R(const Ipp8u* pSrc[3], int srcStep, Ipp8u* pDst , int dstStep, IppiSize roiSize, Ipp8u aval);

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. Array of pointers to the ROI in each separate source color planes for planar images.

srcStep

Distance in bytes between starts of consecutive lines in the source image.

pDst

Pointer to the destination image ROI. Array of pointers to the ROI in the separate destination color planes for planar images.

dstStep

Distance in bytes between starts 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'Cb'Cr' image pSrc to the 24-bit gamma-corrected R'G'B' image pDst. The following formulas are used for conversion:

R' = 1.164*(Y' - 16) + 1.596*(Cr' - 128)

G' = 1.164*(Y' - 16) - 0.813*(Cr' - 128) - 0.392*(Cb' - 128)

B' = 1.164*(Y' - 16) + 2.017*(Cb' - 128)

The output R'G'B' values are saturated to the range [0..255].

The fourth channel is created by setting channel values to the constant value aval.

Return Values

ippStsNoErr

Indicates no error. Any other value indicates an error or a warning.

ippStsNullPtrErr

Indicates an error condition if pSrc or pDst pointer is NULL.

ippStsSizeErr

Indicates an error condition if roiSize has a field with a zero or negative value.