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 ifpSrcorpDstisNULL.
- ippStsSizeErr
- Indicates an error condition ifroiSize.widthis less than 2 orroiSize.heightis less than 2.
- ippStsDoubleSize
- Indicates a warning ifroiSizehas a field that is not a multiple of 2.