Intel® Integrated Performance Primitives Developer Reference

Developer Reference

  • 2021
  • 03/26/2021
  • Public Content
Contents

YCbCr422ToGray

Converts an interlaced 4:2:2 YCbCr or YCrCb image to gray-scale extracting luminance (Y) component.

Syntax

IppStatus ippiYCbCr422ToGray_8u_C2C1R(const Ipp8u*
pSrc
, int
srcStep
, 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
Pointer to the source image ROI.
srcStep
Distance, in bytes, between the starting points of consecutive lines in the source image.
pDst
Pointer to the destination image ROI.
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.
Description
This function operates with ROI (see Regions of Interest in Intel IPP).
This function converts an interlaced
Y'Cb'Cr'
 or
Y'Cr'Cb'
 image
pSrc
 with the 4:2:2 sampling (see Table
“Pixel-Order Image Formats”
 and Table
“Planar Image Formats”
 for more details) to the gray-scale image
pDst
 extracting luminance (Y) component.
Y'Cb'Cr'
 image with 4:2:2 sampling is also known as YUY2 format, and
Y'Cr'Cb'
 as YVYU.
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
ippiYCbCr422ToGray_8u_C2C1R
 function.
    const int WIDTH  = 2;
    const int HEIGHT = 2;

    Ipp8u pSrc[WIDTH * HEIGHT * 2] = {
        190,70,191,80,
        200,71,201,81,
    };
    Ipp8u pDst[WIDTH * HEIGHT];
    int srcStep = WIDTH * 2, dstStep  = WIDTH;
    IppiSize roiSize = {WIDTH, HEIGHT};
    IppStatus status = ippiYCbCr422ToGray_8u_C2C1R(pSrc, srcStep, pDst, dstStep, roiSize);
    if ( status == ippStsNoErr) 
        printf("PASS:\n%3d %3d\n%3d %3d\n", pDst[0], pDst[1], pDst[2], pDst[3]);
    else 
        printf("FAIL: status = %d\n", status);
Result:
PASS:
190 191
200 201

Product and Performance Information

1

Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.