CbYCr422ToBGR_709HDTV
Converts 16-bit per pixel CbYCr image to the BGR image for ITU-R BT.709 HDTV signal.
Syntax
IppStatus ippiCbYCr422ToBGR_709HDTV_8u_C2C3R(const Ipp8u*
pSrc
, int
srcStep
, Ipp8u*
pDst
, int
dstStep
, IppiSize
roiSize
);
IppStatus ippiCbYCr422ToBGR_709HDTV_8u_C2C4R(const Ipp8u*
pSrc
, int
srcStep
, Ipp8u*
pDst
, int
dstStep
, IppiSize
roiSize
, Ipp8u
aval
);
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.
- aval
- Constant value to create the fourth channel.
Description
This function operates with ROI (see
Regions of Interest in Intel IPP
).
This function converts the
Cb'Y'Cr'
image
pSrc
, packed in
4:2:2 sampling
format, to the three- or four-channel gamma-corrected
B'G'R'
image
pDst
for digital component video signals complied with the ITU-R BT.709 Recommendation
[ITU709]
for high-definition TV (HDTV). A source
CbYCr
image has the following sequence of bytes:
Cb0Y0Cr0Y1
,
Cb1Y2Cr1Y3
, ... . The values of
Y'
are in the range [16..235], the values of
Cb'
,
Cr'
are in the range [16..240]. The conversion is performed according to the following formulas
[Jack01]
:
R' = Y' + 1.540*(Cr' - 128)
G' = Y' - 0.459*(Cr' - 128) - 0.183*(Cb' - 128)
B' = Y' + 1.816*(Cb' - 128)
The destination image pixel values have a nominal range [16..235]. The resulting
R'G'B'
values should be saturated at the 0 and 255 levels.
The output
B'G'R'
values are saturated to the range [0..255].
The fourth channel is created by setting channel values to the constant value
aval
.
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 ifroiSizehas a field with a zero or negative value.