Developer Reference

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

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
-2
0
2 or -6 -12
0
12 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
2
0
-2 or 6 12
0
-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 is
NULL
.
ippStsSizeErr
Indicates an error condition if
roiSize
has a field with a zero or negative value.
ippStsStepErr
Indicates an error condition if
srcStep
or
dstStep
is less than
roiSize.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 if
borderType
or
divisor
has a wrong value.
ippStsMaskErr
Indicates an error condition if
mask
has a wrong value.

Product and Performance Information

1

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Notice revision #20110804