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 ifpSrcorpDstpointer isNULL.
- ippStsSizeErr
- Indicates an error condition ifroiSizehas a field with a zero or negative value.