FilterColumnPipeline, FilterColumnPipeline_Low

Syntax

Include Files

ippcv.h

Domain Dependencies

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

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

Parameters

Description

This function operates with ROI (see Regions of Interest in Intel IPP).

The function ippiFilterColumnPipeline_Low performs calculation exclusively with the 16s-data, and the input data must be in the range ensuring that the overflow does not occur during calculation and the result can be represented by a 32-bit integer number.

These functions apply the column filter of the separable convolution kernel to the source image pSrc. The filter coefficients are placed in the reversed order. For integer data:

and for floating point data:

Here j = 0, ... roiSize.width-1, i=0,... roiSize.height-1.

The size of the source image is

(roiSize.height + kernelSize - 1) * roiSize.width.

The functions requires the external buffer pBuffer, its size should be previously computed by the functions ippiFilterColumnPipelineGetBufferSize and ippiFilterColumnPipelineGetBufferSize_Low respectively.

Return Values

Example

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//   An example of performing The code example shows how these functions can be used to organize the separable convolution as a step of
// image processing pipeline.implemented with Intel® Integrated Primitives (Intel® IPP) functions :
//     ippiFilterRowBorderPipelineGetBufferSize_Low_16s_C1R
//     ippiFilterColumnPipeline_Low_16s_C1R
//     ippiFilterColumnPipelineGetBufferSize_Low_16s_C1R
//     ippiFilterRowBorderPipeline_Low_16s_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® 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;
    const Ipp16s **pGet = NULL;
    Ipp16s* src = NULL, *dst = NULL;
    int kernelSize = 3;
    int xAnchor = kernelSize >> 1; /* The anchor value, (0 <= xAnchor < kernelSize) */
    Ipp16s pKerX[3] = { 1, 2, 1 }, pKerY[3] = { 1, 0, 1 }; /* The pointer to the kernels */
    Ipp16s* 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 */
    IppiSize roi = { WIDTH, 1 }; /* Size of destination ROI in pixels */
    int divisor = 1; /* The value to divide output pixels by */
    Ipp8u borderValue = 0;
    Ipp8u *pBufRow = NULL, *pBufCol = NULL;/* Pointer to the work buffer */
    int sizeRow = 0, sizeCol = 0;    /* Common work buffer size */
    int todo = roiSize.height, bufLen;
    int mStep = (roiSize.width + 7)&(~7);
    int sStep = 0, dStep = 0;
    bufLen = mStep * 3 *sizeof(Ipp16s) + 4*sizeof(Ipp16s*);
    pGet = (const Ipp16s**)ippsMalloc_8u(bufLen);
    pSrc = ippiMalloc_16s_C1(roiSize.width, roiSize.height, &srcStep);
    pDst = ippiMalloc_16s_C1(roiSize.width, roiSize.height, &dstStep);

    dst = pDst; src = pSrc;
    sStep = srcStep >> 1, dStep = dstStep >> 1;
    pGet[0] = pGet[1] = (Ipp16s*)(pGet + 4);
    pGet[2] = pGet[1] + mStep;
    pGet[3] = pGet[2] + mStep;

    check_sts( status = ippiFilterRowBorderPipelineGetBufferSize_Low_16s_C1R(roiSize, 3, &sizeRow) )

    check_sts( status = ippiFilterColumnPipelineGetBufferSize_Low_16s_C1R(roiSize, 3, &sizeCol) )

    pBufRow = ippsMalloc_8u(sizeRow);
    pBufCol = ippsMalloc_8u(sizeCol);

    check_sts( status = ippiFilterRowBorderPipeline_Low_16s_C1R(pSrc, srcStep, ( Ipp16s**)pGet, roi, pKerX, kernelSize, xAnchor, ippBorderRepl, borderValue, divisor, pBufRow) )

    todo--;
    if (todo==0)
    {
        pGet[2] = pGet[0];
    }
    else {
        pGet[2] = pGet[0] + mStep; pGet[3] = pGet[2] + mStep;
        for (; todo>0;src += sStep, dst += dStep, todo--)
        {
            check_sts( status = ippiFilterRowBorderPipeline_Low_16s_C1R(src, srcStep, (Ipp16s**)(pGet + 2), roi, pKerX, kernelSize, xAnchor, ippBorderRepl, borderValue, divisor, pBufRow) )

            check_sts( status = ippiFilterColumnPipeline_Low_16s_C1R(pGet, dst, dstStep, roi, pKerY, kernelSize, divisor, pBufCol) )

            pGet[0] = pGet[1]; pGet[1] = pGet[2]; pGet[2] = pGet[3]; pGet[3] = pGet[0];
        }
    }
    check_sts( status = ippiFilterColumnPipeline_Low_16s_C1R(pGet, dst, dstStep, roi, pKerY, kernelSize, divisor, pBufCol) )

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