Visible to Intel only — GUID: GUID-ACBC6703-F634-4C6A-A427-23EE793015A3
Visible to Intel only — GUID: GUID-ACBC6703-F634-4C6A-A427-23EE793015A3
BGRToYCrCb420_709CSC
Converts a BGR image to the YCrCb image with 4:2:0 sampling for ITU-R BT.709 CSC signal.
Syntax
IppStatus ippiBGRToYCrCb420_709CSC_8u_AC4P3R(const Ipp8u* pSrc, int srcStep, Ipp8u* pDst[3], int dstStep[3], IppiSize roiSize);
IppStatus ippiBGRToYCrCb420_709CSC_8u_C3P3R(const Ipp8u* pSrc, int srcStep, Ipp8u* pDst[3], int dstStep[3], 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 starts of consecutive lines in the source image. |
pDst |
An array of pointers to ROI in separate planes of the destination image. |
dstStep |
An array of distances in bytes between starts of consecutive lines in the destination image planes. |
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 three- or four-channel gamma-corrected B'G'R' image pSrc to the planar Y'Cr'Cb' image pDst for digital component video signals complied with the ITU-R BT.709 Recommendation [ITU709] for computer systems consideration (CSC). The source image pixel values are in the range [0..255]. The conversion is performed according to the following formulas [Jack01]:
Y' = 0.183*R' + 0.614*G' + 0.062*B' + 16
Cb' = -0.101*R' - 0.338*G' + 0.439*B' + 128
Cr' = 0.439*R' - 0.399*G' - 0.040*B' + 128
The destination image pDst has 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.width is less than 2 or roiSize.height is less than 2. |
ippStsDoubleSize |
Indicates a warning if roiSize has a field that is not a multiple of 2. |