Visible to Intel only — GUID: GUID-F3390D14-6F61-4EA7-9037-3BCB9FC5DF25
Visible to Intel only — GUID: GUID-F3390D14-6F61-4EA7-9037-3BCB9FC5DF25
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