Intel® Integrated Performance Primitives (Intel® IPP) Developer Guide and Reference

ID 790148
Date 3/22/2024
Public
Document Table of Contents

FilterBoxBorder

Blurs an image using a simple box filter.

Syntax

IppStatus ippiFilterBoxBorder_<mod>(const Ipp<datatype>* pSrc, int srcStep, Ipp<datatype>* pDst, int dstStep, IppiSize roiSize, IppiSize maskSize, IppiBorderType border, const Ipp<datatype>* borderValue, Ipp8u* pBuffer);

Supported values for mod:

8u_C1R 16u_C1R 16s_C1R 32f_C1R

IppStatus ippiFilterBoxBorder_<mod>(const Ipp<datatype>* pSrc, int srcStep, Ipp<datatype>* pDst, int dstStep, IppiSize roiSize, IppiSize maskSize, IppiBorderType border, const Ipp<datatype> borderValue[3], Ipp8u* pBuffer);

Supported values for mod:

8u_C3R 16u_C3R 16s_C3R 32f_C3R
  16u_C4R 16s_C4R  
  16u_AC4R 16s_AC4R  

IppStatus ippiFilterBoxBorder_<mod>(const Ipp<datatype>* pSrc, int srcStep, Ipp<datatype>* pDst, int dstStep, IppiSize roiSize, IppiSize maskSize, IppiBorderType border, const Ipp<datatype> borderValue[4], Ipp8u* pBuffer);

Supported values for mod:

8u_C4R 32f_C4R
8u_AC4R 32f_AC4R

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.

srcStep

Distance, in bytes, between the starting points of consecutive lines in the source image.

pDst

Pointer to the destination image.

dstStep

Distance, in bytes, between the starting points of consecutive lines in the destination image.

roiSize

Size of the destination ROI in pixels.

maskSize

Size of the mask in pixels.

border

Type of border. Possible values are:

ippBorderConst

Values of all border pixels are set to constant.

ippBorderRepl

Border is replicated from the edge pixels.

ippBorderInMem

Border is obtained from the source image pixels in memory.

ippBorderMirror

Border pixels are mirrored from the source image boundary pixels.

Mixed borders are also supported. They can be obtained by the bitwise operation OR between ippBorderRepl and ippBorderInMemTop, ippBorderInMemBottom, ippBorderInMemLeft, ippBorderInMemRight.

borderValue

Constant value to assign to pixels of the constant border. This parameter is applicable only to the ippBorderConst border type.

pBuffer

Pointer to the work buffer.

Description

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

This function operates with ROI.

This function sets each pixel in the destination image as the average of all pixels of the source image in the rectangular neighborhood of size maskSize with the anchor cell at that pixel. This has the effect of smoothing or blurring the input image. To ensure valid operation when image boundary pixels are processed, the application must correctly define additional border pixels. If pSrc is equal to pDst, ippiFilterBoxBorder operates as an in-place function.

Return Values

ippStsNoErr

Indicates no error.

ippStsNullPtrErr

Indicates an error when pSrc or pDst is NULL.

ippStsSizeErr

Indicates an error if roiSize has a field with zero or negative value.

ippStsMaskSizeErr

Indicates an error if mask has an illegal value.

ippStsBorderErr

Indicates an error when border has an illegal value.

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 simple box filter
// implemented with Intel(R) Integrated Performance Primitives (Intel(R) IPP) functions:
//     ippiFilterBoxBorderGetBufferSize
//     ippiFilterBoxBorder_8u_C1R


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

#define WIDTH  128  /* image width  */
#define HEIGHT  64  /* 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(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 = NULL, *pDst = NULL;     /* Pointers to source/destination images */
    int srcStep = 0, dstStep = 0;         /* Steps, in bytes, through the source/destination images */
    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 = ippBorderRepl;
    Ipp8u borderValue = 254;
    IppiSize maskSize = {5,5};
    int numChannels = 1;

    pSrc = ippiMalloc_8u_C1(roiSize.width, roiSize.height, &srcStep);
    pDst = ippiMalloc_8u_C1(roiSize.width, roiSize.height, &dstStep);

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

    pBuffer = ippsMalloc_8u(iTmpBufSize);

    check_sts( status = ippiFilterBoxBorder_8u_C1R(pSrc, 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;
}