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

ID 790148
Date 3/22/2024
Public

A newer version of this document is available. Customers should click here to go to the newest version.

Document Table of Contents

YCbCr420ToBGR_709CSC

Converts a YCbCr image with 4:2:0 sampling to the BGR image for ITU-R BT.709 CSC signal.

Syntax

IppStatus ippiYCbCr420ToBGR_709CSC_8u_P3C3R(const Ipp8u* pSrc[3], int srcStep[3], Ipp8u* pDst, 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

An array of pointers to ROI in separate planes of the source image.

srcStep

An array of distances in bytes between starts of consecutive lines in the source image planes.

pDst

Pointer to the destination image ROI.

dstStep

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

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 planar Y'Cb'Cr' image pSrc to the three-channel gamma-corrected B'G'R' image pDst for digital component video signals complied with the ITU-R BT.709 Recommendation [ITU709] for computer systems consideration (CSC). The conversion is performed according to the following formulas [Jack01]:

R' = 1.164*(Y' - 16) + 1.793*(Cr' - 128)

G' = 1.164*(Y' - 16) - 0.534*(Cr' - 128) - 0.213*(Cb' - 128)

B' = 1.164*(Y' - 16) + 2.115*(Cb' - 128)

The output R'G'B' values are saturated to the range [0..255]. The source image pDst has the 4:2:0 sampling format (see Table “Planar Image Formats” for more details).

The values of roiSize.width and roiSize.height should be multiples of 2. Otherwise, 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.