FilterSobelNegVertBorder
Applies vertical Sobel filter with border.
Syntax
IppStatus ippiFilterSobelNegVertBorder_<mod>(const Ipp<srcDatatype>*
pSrc
, int
srcStep
, Ipp<dstDatatype>*
pDst
, int
dstStep
, IppiSize
dstRoiSize
, IppiMaskSize
mask
, IppiBorderType
borderType
, Ipp<srcDatatype>
borderValue
, Ipp8u*
pBuffer
);
Supported values for
mod
:8u16s_C1R | 32f_C1R |
Include Files
ippi.h
Domain Dependencies
Headers:
ippcore.h
,
ippvm.h
,
ipps.h
Libraries:
ippcore.lib
,
ippvm.lib
,
ipps.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 destination image ROI.
- dstStep
- Distance in bytes between starts of consecutive lines in the destination image.
- dstRoiSize
- Size of the destination image ROI.
- mask
- Type of the filter kernel.
- borderType
- Type of border (see Borders in Neighborhood Operations ); following values are possible:
- ippBorderConst
- Values of all border pixels are set to constant.
- ippBorderRepl
- Replicated border is used.
- ippBorderMirror
- Mirrored border is used
- ippBorderMirrorR
- Mirrored border with replication is used
- borderValue
- The constant value to assign to the pixels in the constant border (not applicable for other border's type).
- pBuffer
- Pointer to the working buffer.
Description
These functions operate with ROI (see Regions of Interest in Intel IPP). These functions apply the vertical Sobel filter (
x
-derivative) to the source image ROI pSrc
and stores results to the destination image ROI of the same size pDst
. Source image can be used as the destination image if they have the same data type. The values of border pixels are assigned in accordance with the borderType
and borderValue
parameters. The kernel of this filter is the matrix of either 3x3 or 5x5 size that is specified by the parameter mask
. The anchor cell is the center cell of the kernel (red).The function
ippiFilterSobelVertBorde
uses the kernels with the following coefficients:-1 -2 0 2 1
-1 0 1 -4 -8 0 8 4
-202 or -6 -12012 6
-1 0 1 -4 -8 0 8 4
-1 -2 0 2 1
The function
ippiFilterSobelNegVertBoreder
uses the kernels which coefficients are the same in magnitude but opposite in sign:1 2 0 -2 -1
1 0 -1 4 8 0 -8 -4
20-2 or 6 120-12 -6
1 0 -1 4 8 0 -8 -4
1 2 0 -2 -1
Before using this function, compute the size of the work buffer
pBuffer
using the FilterSobelNegVertBorderGetBufferSize function.Example shows how the function
ippiFilterSobelNegVertBorder_8u16s_C1R
can be used for edge detection.Return Values
- ippStsNoErr
- Indicates no error. Any other value indicates an error or a warning.
- ippStsNullPtrErr
- Indicates an error condition if one of the specified pointers isNULL.
- ippStsSizeErr
- Indicates an error condition ifroiSizehas a field with a zero or negative value.
- ippStsStepErr
- Indicates an error condition ifsrcStepordstStepis less thanroiSize.width* <pixelSize>
- ippStsNotEvenStepErr
- Indicates an error condition if one of the step values is not divisible by 4 for floating-point images, or by 2 for short-integer images.
- ippStsBadArgErr
- Indicates an error ifborderTypeordivisorhas a wrong value.
- ippStsMaskErr
- Indicates an error condition ifmaskhas a wrong value.