Visible to Intel only — GUID: GUID-0AF41963-2E26-496E-9C0B-B81D2557198B
Visible to Intel only — GUID: GUID-0AF41963-2E26-496E-9C0B-B81D2557198B
BGRToYCbCr420_709HDTV
Converts a BGR image to the YCbCr image with 4:2:0 sampling for ITU-R BT.709 HDTV signal.
Syntax
IppStatus ippiBGRToYCbCr420_709HDTV_8u_AC4P3R(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 four-channel gamma-corrected B'G'R' image pSrc to the planar Y'Cb'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 destination 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 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. |