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

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

YCbCr420ToBGR_709HDTV

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

Syntax

IppStatus ippiYCbCr420ToBGR_709HDTV_8u_P3C4R(const Ipp8u* pSrc[3], int srcStep[3], 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

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.

aval

Constant value to create fourth channel.

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 four-channel gamma-corrected B'G'R' image pDst for digital component video signals complied with the ITU-R BT.709 Recommendation [ITU709] for high-definition TV (HDTV). The values of Y' are in the range [16..235], the values of Cb', Cr' are in the range [16..240]. The conversion is performed according to the following formulas [Jack01]:

R' = Y' + 1.540*(Cr' - 128)

G' = Y' - 0.459*(Cr' - 128) - 0.183*(Cb' - 128)

B' = Y' + 1.816*(Cb' - 128)

The destination image pixel values have a nominal range [16..235]. The resulting R'G'B' values should be saturated at the 0 and 255 levels.

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 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.