FilterMedianBorder

Syntax

Include Files

ippi.h

Domain Dependencies

Headers: ippcore.h, ippvm.h, ipps.h

Libraries: ippcore.lib, ippvm.lib, ipps.lib

Parameters

Description

This function operates with ROI.

Before using this function, you need to compute the size of the work buffer pBuffer using the ippiFilterMedianBorderGetBufferSize function.

The ippiFilterMedianBorder function applies a median filter to an image ROI. The anchor cell is the center of the filter kernel. The size of the source image ROI is equal to the size of the destination image ROI dstRoiSize.

This function sets each pixel in the destination buffer as the median value of all source pixels values from the neighborhood of the processed pixel.

This function removes noise and does not cut out signal brightness drops, as an averaging filter does.

Return Values

Example

/*******************************************************************************
* Copyright 2015 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.
*******************************************************************************/

//   A simple example of performing Bluring an image using a median filter
// implemented with Intel® Integrated Primitives (Intel® IPP) functions:
//     ippiFilterMedianBorderGetBufferSize
//     ippiFilterMedianBorder_8u_C1R


#include <stdio.h>
#include "ipp.h"

#define WIDTH  16  /* image width  */
#define HEIGHT 16  /* image height */

/* 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® IPP function returned status different from ippStsNoErr */

/* Results of ippMalloc() are not validated because Intel® IPP functions perform bad arguments check and will return an appropriate status  */

int main(void)
{
    IppStatus status = ippStsNoErr;
    Ipp8u* pSrc = NULL, *pDst = NULL;     /* Pointers to source/destination images */
    int srcStep = 0, dstStep = 0;         /* Steps, in bytes, through the source/destination images */
    IppiSize srcImageSize = { WIDTH+1, HEIGHT+1}; /* size of source image in pixels */
    IppiSize roiSize = { WIDTH, HEIGHT }; /* Size of source/destination ROI in pixels */
    Ipp8u *pBuffer = NULL;                /* Pointer to the work buffer */
    int iTmpBufSize = 0;                  /* Common work buffer size */
    IppiBorderType borderType = (IppiBorderType)(ippBorderRepl | ippBorderInMemTop | ippBorderInMemRight);
    Ipp8u borderValue = 254;
    IppiSize maskSize = { 3, 3 };
    int numChannels = 1;

    /* memory allocation */
    pSrc = ippiMalloc_8u_C1(srcImageSize.width, srcImageSize.height, &srcStep);
    pDst = ippiMalloc_8u_C1(roiSize.width, roiSize.height, &dstStep);

    check_sts( status = ippiFilterMedianBorderGetBufferSize(roiSize, maskSize, ipp8u, numChannels, &iTmpBufSize) )

    pBuffer = ippsMalloc_8u(iTmpBufSize);

    check_sts( status = ippiFilterMedianBorder_8u_C1R(pSrc + srcStep, srcStep, pDst, dstStep, roiSize, maskSize, borderType, borderValue, pBuffer) )

EXIT_MAIN
    ippsFree(pBuffer);
    ippiFree(pSrc);
    ippiFree(pDst);
    printf("Exit status %d (%s)\n", (int)status, ippGetStatusString(status));
    return (int)status;
}