Integral
Transforms an image to the integral representation.
Syntax
IppStatus ippiIntegral_8u32s_C1R(const Ipp8u*
pSrc
, int
srcStep
, Ipp32s*
pDst
, int
dstStep
, IppiSize
srcRoiSize
, Ipp32s
val
);
IppStatus ippiIntegral_8u32f_C1R(const Ipp8u*
pSrc
, int
srcStep
, Ipp32f*
pDst
, int
dstStep
, IppiSize
srcRoiSize
, Ipp32f
val
);
IppStatus ippiIntegral_32f_C1R(const Ipp32f*
pSrc
, int
srcStep
, Ipp32f*
pDst
, int
dstStep
, IppiSize
srcRoiSize
);
Include Files
ippcv.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
- Pointer to the ROI in the destination integral image.
- dstStep
- Distance in bytes between starts of consecutive lines in the destination image.
- srcRoiSize
- Size of source and destination image ROI in pixels.
- val
- The value to add topDstimage pixels.
Description
This function operates with ROI (see
Regions of Interest in Intel IPP
). This function transforms a source image 
pSrc
to the integral image
pDst
. Pixel values of the destination image
pDst
are computed using pixel values of the source image
pSrc
and the specified value
val
in accordance with the following formula:
where
i
,
j
are coordinates of the destination image pixels (see Figure 11-1 ) varying in the range
i
= 1 ,...,
srcRoiSize.height
,
j
= 0,...,
srcRoiSize.width
. Pixel values of zero row and column of
pDst
(
i
=0) is set to
val
.
For the
ippiIntegral_32f_C1
function flavor the value of
val
is considered to be equal to zero.
The size of the destination images is (
srcRoiSize.width
+ 1) x (
srcRoiSize.height
+ 1).
Figure
“Operation of the Integral and TiltedIntegral functions”
shows what pixels (red circles) of the source image are used in computation new pixel values in the
i
,
j
coordinates.
For large images the result of summation can exceed the upper bound of the output data type.
Table
“Maximum Image Size for Integral Functions”
lists the maximum image size for different function flavors and values.
Operation of the Integral and TiltedIntegral functions
Function Flavor |
Value
val |
Maximum Image Size |
|---|---|---|
ippiIntegral_8u32s_C1R |
0 |
(2
31
-1)/255 |
-2
31 |
2
32
/255 | |
ippiIntegral_8u32f_C1R |
0 |
2
24
/255 |
-2
24 |
(2
25
+1)/255 |
Return Values
- ippStsNoErr
- Indicates no error.
- ippStsNullPtrErr
- Indicates an error ifpSrcorpDstisNULL.
- ippStsSizeErr
- Indicates an error condition ifsrcRoiSizehas a field with zero or negative value.
- ippStsStepErr
- Indicates an error condition ifsrcStepis less thansrcRoiSize.width*<pixelSize>, ordstStepis less than(srcRoiSize.width+1)*<pixelSize>.
- ippStsNotEvenStepErr
- Indicates an error condition ifsrcStepordstStepis not divisible by<pixelSize>.
Example
The code example below demonstrates how to use the
ippiIntegral_8u32s_C1R
function:void func_integral_8u32s_C1R() { Ipp8u pSrc[5*4]; Ipp32s pDst[6*5]; IppiSize ROI = {5,4}; ippiSet_8u_C1R(1,pSrc,5,ROI); Ipp32s val = 1; ippiIntegral_8u32s_C1R(pSrc, 5, pDst, 6*sizeof(Ipp32s), ROI, val); }
Result:
pSrc -> 1 1 1 1 1 pDst -> 1 1 1 1 1 1 1 1 1 1 1 1 2 3 4 5 6 1 1 1 1 1 1 3 5 7 9 11 1 1 1 1 1 1 4 7 10 13 16 1 5 9 13 17 21
The code example below demonstrates how to use the
ippiIntegral_32f_C1R
function:void func_integral_32f_C1R() { Ipp32f pSrc[5*4]; Ipp32f pDst[6*5]; IppiSize ROI = {5, 4}; ippiSet_32f_C1R(1, pSrc, 5*sizeof(Ipp32f), ROI); ippiIntegral_32f_C1R(pSrc, 5*sizeof(Ipp32f), pDst, 6*sizeof(Ipp32f), ROI); }
Result:
pSrc -> 1.0 1.0 1.0 1.0 1.0 pDst -> 0.0 0.0 0.0 0.0 0.0 0.0 1.0 1.0 1.0 1.0 1.0 0.0 1.0 2.0 3.0 4.0 5.0 1.0 1.0 1.0 1.0 1.0 0.0 2.0 4.0 6.0 8.0 10.0 1.0 1.0 1.0 1.0 1.0 0.0 3.0 6.0 9.0 12.0 15.0 0.0 4.0 8.0 12.0 16.0 20.0