ColorTwist32f
Applies a color twist matrix to an image with integer
pixel values.
Syntax
Case 1: Not-in-place operation on pixel-order
data
IppStatus
ippiColorTwist32f_<mod>(const Ipp<datatype>*
pSrc
, int
srcStep
, Ipp<datatype>*
pDst
, int
dstStep
, IppiSize
roiSize
, const Ipp32f
twist
[3][4]
);
Supported values for
mod
:8u_C3R | 16u_C3R | 16s_C3R |
8u_AC4R | 16u_AC4R | 16s_AC4R |
Case 2: Not-in-place operation on planar data
IppStatus
ippiColorTwist32f_<mod>(const Ipp<datatype>*
pSrc
[3], int
srcStep
, Ipp<datatype>*
pDst
[3], int
dstStep
, IppiSize
roiSize
, const Ipp32f
twist
[3][4]
);
Supported values for
mod
:8u_P3R | 16u_P3R | 16s_P3R |
Case 3: In-place operation on pixel-order data
IppStatus
ippiColorTwist32f_<mod>(Ipp<datatype>*
pSrcDst
, int
srcDstStep
, IppiSize
roiSize,
const Ipp32f
twist
[3][4]
);
Supported values for
mod
:8u_C3IR | 16u_C3IR | 16s_C3IR |
8u_AC4IR | 16u_AC4IR | 16s_AC4IR |
Case 4: In-place operation on planar data
IppStatus
ippiColorTwist32f_<mod>(Ipp<datatype>*
pSrcDst
[3], int
srcDstStep
, IppiSize
roiSize
, const Ipp32f
twist
[3][4]
);
Supported values for
mod
:8u_IP3R | 16u_IP3R | 16s_IP3R |
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 the starting points of consecutive lines in the source image.
- pDst
- Pointer to the destination image ROI.
- dstStep
- Distance, in bytes, between the starting points of consecutive lines in the destination image.
- pSrcDst
- Pointer to the source and destination image ROI for the in-place operation.
- srcDstStep
- Distance, in bytes, between the starting points of consecutive lines in the source and destination image for the in-place operation.
- roiSize
- Size of the source and destination ROI in pixels.
- twist
- The array containing color-twist matrix elements.
Description
This function operates with ROI (see Regions of Interest in Intel
IPP).
This function applies the color-twist matrix to all three color
channel values in the integer source image to obtain the resulting data in the
destination image. For example, the conversion from the
RGB
to the YCbCr
format can be done asY = 0.299*R + 0.587*G +
0.114*B
Cb = - 0.16874*R -
0.33126*G + 0.5*B + 0.5
Cr = 0.5*R - 0.41869*G -
0.08131*B + 0.5
which can be described in terms of the following color twist
matrix:
0.29900f 0.58700f 0.11400f 0.000f -0.16874f -0.33126f 0.50000f 128.0f 0.50000f -0.41869f -0.08131f 128.0f
Color-twist matrices may also be used to perform many other color
conversions.
Return Values
- ippStsNoErr
- Indicates no error. Any other value indicates an error.
- ippStsNullPtrErr
- Indicates an error condition ifpSrc,pDst, orpSrcDstisNULL.
- ippStsSizeErr
- Indicates an error condition ifroiSizehas a field with a zero or negative value.