Developer Reference

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

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 if
pSrc
or
pDst
is
NULL
.
ippStsSizeErr
Indicates an error condition if
roiSize
has a field with a zero or negative value.
ippStsDoubleSize
Indicates a warning if
roiSize
has a field that is not a multiple of 2.

Product and Performance Information

1

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Notice revision #20110804