Developer Reference

  • 2020
  • 10/21/2020
  • Public Content
Contents

YCbCr420ToBGR_709CSC

Converts a YCbCr image with 4:2:0 sampling to the BGR image for ITU-R BT.709 CSC signal.

Syntax

IppStatus ippiYCbCr420ToBGR_709CSC_8u_P3C3R(const Ipp8u*
pSrc
[3], int
srcStep
[3], 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
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.
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 three-channel gamma-corrected B'G'R' image
pDst
for digital component video signals complied with the ITU-R BT.709 Recommendation [ITU709] for computer systems consideration (CSC). The conversion is performed according to the following formulas [Jack01]:
R' = 1.164*(Y' - 16) + 1.793*(Cr' - 128)
G' = 1.164*(Y' - 16) - 0.534*(Cr' - 128) - 0.213*(Cb' - 128)
B' = 1.164*(Y' - 16) + 2.115*(Cb' - 128)
The output
R'G'B'
values are saturated to the range [0..255]. 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 the 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

Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.