Developer Reference

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

RGBToYCbCr420

Converts an RGB image to the YCbCr color model; uses 4:2:0 sampling.

Syntax

IppStatus ippiRGBToYCbCr420_8u_C3P3R(const Ipp8u*
pSrc
, int
srcStep
, Ipp8u*
pDst
[3], int
dstStep
[3], IppiSize
roiSize
);
IppStatus ippiRGBToYCbCr420_8u_C3P2R(const Ipp8u*
pSrc
, int
srcStep
, Ipp8u*
pDstY
, int
dstYStep
, Ipp8u*
pDstCbCr
, int
dstCbCrStep
, IppiSize
roiSize
);
IppStatus ippiRGBToYCbCr420_8u_C4P2R(const Ipp8u*
pSrc
, int
srcStep
, Ipp8u*
pDstY
, int
dstYStep
, Ipp8u*
pDstCbCr
, int
dstCbCrStep
, 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
Pointer to the source image ROI.
srcStep
Distance in bytes between starts of consecutive lines in the source image.
pDst
An array of pointers to ROI in the separate planes of the destination image for three-plane image.
dstStep
Array of distances in bytes between starts of consecutive lines in each plane of the destination image for three-plane image.
pDstY
Pointer to ROI in the luminance plane of the destination image for two-plane image.
dstStep
,
dstYStep
Distance in bytes between starts of consecutive lines in the luminance plane for two-plane image.
pDstCbCr
Pointer to ROI in the interleaved chrominance plane of the destination image for two-plane image.
dstCbCrStep
Distance in bytes between starts of consecutive lines in the interleaved chrominance plane for two-plane 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 the gamma-corrected
R'G'B'
image
pSrc
to the
Y'Cb'Cr'
image according to the same formulas as the function
ippiRGBToYCbCr
does. The difference is that
ippiRGBToYCbCr420
uses
4:2:0 sampling
format for the converted image (see Table
“Planar Image Formats”
for more details).
roiSize.width
should be multiple of 2, and
roiSize.height
should be multiple of 2 (for three-plane image) or 4 (for two-plane image). If not the function reduces their original values to the nearest multiples of 2 or 4 correspondingly, performs operation, and returns 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 value less than 2.
ippStsDoubleSize
Indicates a warning if
roiSize.width
is not a multiple of 2, or if
roiSize.height
is not a multiple of 2 (for three-plane image) or 4 (for two-plane image).

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