Developer Reference

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

BGRToYCbCr420

Converts a BGR image to the YCbCr image with 4:2:0 sampling format.

Syntax

IppStatus ippiBGRToYCbCr420_8u_C3P3R(const Ipp8u*
pSrc
, int
srcStep
, Ipp8u*
pDst
[3], int
dstStep
[3], IppiSize
roiSize
);
IppStatus ippiBGRToYCbCr420_8u_C3P2R(const Ipp8u*
pRGB
, int
rgbStep
, Ipp8u*
pY
, int
yStep
, Ipp8u*
pCbCr
, int
cbCrStep
, IppiSize
roiSize
);
IppStatus ippiBGRToYCbCr420_8u_AC4P3R(const Ipp8u*
pSrc
, int
srcStep
, Ipp8u*
pDst
[3], int
dstStep
[3], IppiSize
roiSize
);
IppStatus ippiBGRToYCbCr420_8u_AC4P2R(const Ipp8u*
pRGB
, int
rgbStep
, Ipp8u*
pY
, int
yStep
, Ipp8u*
pCbCr
, int
cbCrStep
, 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
,
pRGB
Pointer to the source image ROI.
pY
Pointer to the image Y plane.
srcStep
,
rgbStep
Distance, in bytes, between the starting points of consecutive lines in the source image.
yStep
Distance, in bytes, between the starting points of consecutive lines in the image Y plane.
pDst
,
pCbCr
An array of pointers to ROI in separate planes of the destination image.
dstStep
,
cbCrStep
An array of distances, in bytes, between the starting points of consecutive lines in the destination image planes.
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 three- or four-channel gamma-corrected B'G'R' image to the planar
Y'Cb'Cr'
image according to the same formulas as the function
ippiRGBToYCbCr
does. The difference is that
ippiBGRToYCbCr420
uses
4:2:0 sampling
format (see Table
“Planar Image Formats”
for more details).
roiSize.width
and
roiSize.height
should be multiples of 2. If not the function reduces their original values to the nearest multiples of 2, 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
(
pRGB
)
or
pDst
(
pCbCr
)
is
NULL
.
ippStsSizeErr
Indicates an error condition if
roiSize.width
is less than 2 or
roiSize.height
is less than 2.
ippStsDoubleSize
Indicates a warning if
roiSize
has a field that is not a multiple of 2.

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