YCbCr420ToBGR_709HDTV
Converts a YCbCr image with 4:2:0 sampling to the BGR
image for ITU-R BT.709 HDTV signal.
Syntax
IppStatus
ippiYCbCr420ToBGR_709HDTV_8u_P3C4R(const Ipp8u*
pSrc
[3], int
srcStep
[3], 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
- An array of pointers to ROI in separate planes of the source image.
- srcStep
- An array of distances in bytes between starts of consecutive lines in the source image planes.
- 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 fourth channel.
Description
This function operates with ROI (see Regions of Interest in Intel
IPP).
This function converts a planar
Y'Cb'Cr'
image pSrc
to the 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). 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 source 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 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 ifroiSizehas a field with a zero or negative value.
- ippStsDoubleSize
- Indicates a warning ifroiSizehas a field that is not a multiple of 2.