Developer Reference

  • 2020
  • 07/15/2020
  • Public Content
Contents

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 if
pSrc
or
pDst
is
NULL
.
ippStsSizeErr
Indicates an error condition if
roiSize
has a field with a zero or negative value.

Product and Performance Information

1

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Notice revision #20110804