YCrCb420ToRGB, YCrCb420ToBGR
Convert a YCrCb image with the 4:2:0 sampling to the RGB
or BGR image.
Syntax
IppStatus ippiYCrCb420ToRGB_8u_P3C4R
(const Ipp8u*
pSrc
[3],int
srcStep
[3], Ipp8u*
pDst
, int
dstStep
, IppiSize
roiSize
, Ipp8u
aval
);
IppStatus ippiYCrCb420ToRGB_8u_P2C4R
(const Ipp8u*
pSrcY
, int
srcYStep
, const Ipp8u*
pSrcCrCb
, int
srcCrCbStep
, Ipp8u*
pDst
, int
dstStep
, IppiSize
roiSize
, Ipp8u
aval
);
IppStatus ippiYCrCb420ToRGB_8u_P2C3R
(const Ipp8u*
pSrcY
, int
srcYStep
, const Ipp8u*
pSrcCrCb
, int
srcCrCbStep
, Ipp8u*
pDst
, int
dstStep
, IppiSize
roiSize
);
IppStatus ippiYCrCb420ToBGR_8u_P2C3R
(const Ipp8u*
pSrcY
, int
srcYStep
, const Ipp8u*
pSrcCrCb
, int
srcCrCbStep
, Ipp8u*
pDst
, int
dstStep
, IppiSize
roiSize
);
IppStatus ippiYCrCb420ToBGR_8u_P2C4R
(const Ipp8u*
pSrcY
, int
srcYStep
, const Ipp8u*
pSrcCrCb
, int
srcCrCbStep
, Ipp8u*
pDst
, int
dstStep
, IppiSize
roiSize
, Ipp8u
aval
);
IppStatus
ippiYCrCb420ToBGR_Filter_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 three-plane source image.
- srcStep
- An array of distances, in bytes, between the starting points of consecutive lines in each plane of the three-plane source image.
- pSrcY
- Pointer to ROI in the luminance plane of the two-plane source image.
- srcYStep
- Distance, in bytes, between the starting points of consecutive lines in the luminance plane of the two-plane source image.
- pSrcCrCb
- Pointer to ROI in the interleaved plane chrominance plane of the two-plane source image.
- srcCrCbStep
- Distance, in bytes, between the starting points of consecutive lines in the interleaved chrominance plane of the two-plane source image.
- pDst
- Pointer to the destination image ROI.
- dstStep
- Distance, in bytes, between the starting points 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.
This function converts the
Y'Cr'Cb'
image pSrc
to the gamma-corrected
R'G'B'
or B'G'R'
image pDst
according to the same
formulas as the ippiippiYCbCrToRGB
function does. The difference is that the ippiYCrCb420ToRGB
and ippiYCrCb420ToBGR
functions use
the source data in the 4:2:0 sampling
format, in which the number of Cb and Cr samples is reduced by half in both vertical
and horizontal directions (see Table “Planar
Image Formats”
for more details). Two-plane Y'Cr'Cb
image with 4:2:0 sampling is also
known as NV21 format.The value of
roiSize.width
and roiSize.height
must be a multiple of 2. Otherwise, the function
reduces original values of roiSize.width
and roiSize.height
to the nearest multiples of 2, performs operation,
and returns a warning. Return Values
- ippStsNoErr
- Indicates no error. Any other value indicates an error or a warning.
- ippStsNullPtrErr
- Indicates an error whenpSrcorpDstisNULL.
- ippStsSizeErr
- Indicates an error whenroiSizehas a field with a value less than 2.
- ippStsDoubleSize
- Indicates a warning ifroiSizehas a field that is not a multiple of 2.
Example
The code example below demonstrates how to use the
ippiYCrCb420ToRGB_8u_P2C4R
function.static void sampleNV21ToRGBA() { Ipp8u pY[4*4]= { 236,236,236,236, 236,236,236,236, 236,236,236,236, 236,236,236,236 }; Ipp8u pCbCr[4*2]= { 128,128,128,128, 128,128,128,128 }; Ipp8u pRGB[(4*4)*4]; int YStep = 4, CbCrStep = 4, rgbStep = 4*4; IppiSize roiSize = {4,4}; Ipp8u alpha = 0xFF; IppStatus status = ippiYCrCb420ToRGB_8u_P2C4R(pY, YStep, pCbCr, CbCrStep, pRGB, rgbStep, roiSize, alpha); if ( status == ippStsNoErr) printf("\n ************* passed ****************\n"); else printf("\n ************* failed ****************\t"); }