Developer Reference

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

FilterSobelVertSecondBorder

Applies vertical (second derivative) Sobel filter with border.

Syntax

IppStatus ippiFilterSobelVertSecondBorder_<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
This function operates with ROI (see Regions of Interest in Intel IPP). This function applies the second derivative vertical Sobel filter (
x
-derivative) to the source image
pSrc
and stores results to the destination image of the same size
pDst
. Source image can be used as the destination image if they both 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 kernels have the following values with the anchor in the center cell (red):
1 0 -2 0 1
1 -2 1 4 0 -8 0 4
2
-4
2 or 6 0
-12
0 6
1 -2 1 4 0 -8 0 4
1 0 -2 0 1
The function requires the working buffer
pBuffer
which size should be computed by the function
ippiFilterSobelVertSecondBorderGetBufferSize
beforehand.
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.

Example

/******************************************************************************* * Copyright 2015-2020 Intel Corporation. * * This software and the related documents are Intel copyrighted materials, and * your use of them is governed by the express license under which they were * provided to you (License). Unless the License provides otherwise, you may not * use, modify, copy, publish, distribute, disclose or transmit this software or * the related documents without Intel's prior written permission. * * This software and the related documents are provided as is, with no express * or implied warranties, other than those that are expressly stated in the * License. *******************************************************************************/ //Perform linear filtering of an image using one of // predefined convolution kernels. // ippiFilterSobelVertSecondBorderGetBufferSize // ippiFilterSobelVertSecondBorder_8u16s_C1R #include <stdio.h> #include "ipp.h" /* Next two defines are created to simplify code reading and understanding */ #define EXIT_MAIN exitLine: /* Label for Exit */ #define check_sts(st) if((st) != ippStsNoErr) goto exitLine; /* Go to Exit if Intel(R) Integrated Primitives (Intel(R) IPP) function returned status different from ippStsNoErr */ /* Results of ippMalloc() are not validated because Intel(R) IPP functions perform bad arguments check and will return an appropriate status */ int main(void) { IppStatus status = ippStsNoErr; Ipp8u pSrc[8*8]={ 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 4, 4, 3, 2, 2, 2, 2, 3, 4, 4, 3, 2, 1, 1, 2, 3, 4, 4, 3, 2, 1, 1, 2, 3, 4, 4, 3, 2, 2, 2, 2, 3, 4, 4, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4 }; Ipp16s pDst[8*8]; IppiSize roiSize = { 8, 8 }; Ipp8u borderValue = 3; int pBufferSize = 0; Ipp8u* pBuffer = NULL; check_sts( status = ippiFilterSobelVertSecondBorderGetBufferSize(roiSize, ippMskSize3x3, ipp8u, ipp16s, 1, &pBufferSize)) pBuffer = ippiMalloc_8u_C1 ( 8, 8, &pBufferSize ); check_sts( status = ippiFilterSobelVertSecondBorder_8u16s_C1R ( pSrc, 8, pDst, 8*sizeof(Ipp16s), roiSize, ippMskSize3x3, ippBorderConst, borderValue, pBuffer ) ) EXIT_MAIN ippsFree(pBuffer); printf("Exit status %d (%s)\n", (int)status, ippGetStatusString(status)); return status; } /* Result: 4 4 4 4 4 4 4 4 4 3 3 3 3 3 3 4 4 3 2 2 2 2 3 4 4 3 2 1 1 2 3 4 4 3 2 1 1 2 3 4 pSrc 4 3 2 2 2 2 3 4 4 3 3 3 3 3 3 4 4 4 4 4 4 4 4 4 -4 1 0 0 0 0 1 -4 -7 2 1 0 0 1 2 -7 -8 1 2 1 1 2 1 -8 -8 0 1 3 3 1 0 -8 -8 0 1 3 3 1 0 -8 pDst -8 1 2 1 1 2 1 -8 -7 2 1 0 0 1 2 -7 -4 1 0 0 0 0 1 -4 */

Product and Performance Information

1

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Notice revision #20110804