Developer Reference

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

YCbCrToRGB

Converts a YCbCr image to the RGB color model.

Syntax

Case 1: Operation on pixel-order data
IppStatus ippiYCbCrToRGB_<mod>(const Ipp8u*
pSrc
, int
srcStep
, Ipp8u*
pDst
, int
dstStep
, IppiSize
roiSize
);
Supported values for
mod
:
8u_C3R
8u_AC4R
Case 2: Operation on planar data
IppStatus ippiYCbCrToRGB_8u_P3R(const Ipp8u*
pSrc
[3], int
srcStep
, Ipp8u*
pDst[3]
, int
dstStep
, IppiSize
roiSize
);
IppStatus ippiYCbCrToRGB_8u_P3C3R(const Ipp8u*
pSrc
[3], int
srcStep
, Ipp8u*
pDst
, int
dstStep
, IppiSize
roiSize
);
Case 3: Conversion from planar to pixel-order data
IppStatus ippiYCbCrToRGB_8u_P3C4R(const Ipp8u*
pSrc
[3], 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 for pixel-order image. Array of pointers to the ROI in each separate source color planes for planar images.
srcStep
Distance in bytes between starts of consecutive lines in the source image.
pDst
Pointer to the destination image ROI. Array of pointers to the ROI in the separate destination color planes for planar images.
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
Y'Cb'Cr'
image
pSrc
to the 24-bit gamma-corrected
R'G'B'
image
pDst
. The following formulas are used for conversion:
R' = 1.164*(Y' - 16) + 1.596*(Cr' - 128)
G' = 1.164*(Y' - 16) - 0.813*(Cr' - 128) - 0.392*(Cb' - 128)
B' = 1.164*(Y' - 16) + 2.017*(Cb' - 128)
The output
R'G'B'
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
pointer is
NULL
.
ippStsSizeErr
Indicates an error condition if
roiSize
has a field with a zero or negative value.

Product and Performance Information

1

Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors. These optimizations include SSE2, SSE3, and SSSE3 instruction sets and other optimizations. Intel does not guarantee the availability, functionality, or effectiveness of any optimization on microprocessors not manufactured by Intel. Microprocessor-dependent optimizations in this product are intended for use with Intel microprocessors. Certain optimizations not specific to Intel microarchitecture are reserved for Intel microprocessors. Please refer to the applicable product User and Reference Guides for more information regarding the specific instruction sets covered by this notice.

Notice revision #20110804