Visible to Intel only — GUID: GUID-3971A326-1012-4E5F-89C8-115C5CE9E1DC
Visible to Intel only — GUID: GUID-3971A326-1012-4E5F-89C8-115C5CE9E1DC
BGRToCbYCr422_709HDTV
Converts BGR image to 16-bit per pixel CbYCr image for ITU-R BT.709 HDTV signal.
Syntax
IppStatus ippiBGRToCbYCr422_709HDTV_8u_C3C2R(const Ipp8u* pSrc, int srcStep, Ipp8u* pDst, int dstStep, IppiSize roiSize);
IppStatus ippiBGRToCbYCr422_709HDTV_8u_AC4C2R(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 starts of consecutive lines in the source image. |
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 the three- or four-channel gamma-corrected B'G'R' image pSrc to the two-channel Cb'Y'Cr' image pDst for digital component video signals complied with the ITU-R BT.709 Recommendation [ITU709] for high-definition TV (HDTV). The source image pixel values are in the range [16..235]. The conversion is performed according to the following formulas [Jack01]:
Y' = 0.213*R' + 0.715*G' + 0.072*B'
Cb' = -0.117*R' - 0.394*G' + 0.511*B' + 128
Cr' = 0.511*R' - 0.464*G' - 0.047*B' + 128
The values of Y' of the destination image are in the range [16..235], the values of Cb', Cr' are in the range [16..240]. They should be saturated at the 1 and 254 levels.
The function ippiBGRToCbYCr422_709HDTV uses the 4:2:2 sampling format for the converted image. The alpha-channel information is lost.
A CbYCr image has the following sequence of bytes: Cb0Y0Cr0Y1, Cb1Y2Cr1Y3, ... .
Return Values
ippStsNoErr |
Indicates no error. Any other value indicates an error or a warning. |
ippStsNullPtrErr |
Indicates an error condition if pSrc or pDst pointer is NULL. |
ippStsSizeErr |
Indicates an error condition if roiSize has a field with a zero or negative value. |