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*/
// A simple example of gradient vectors computation over an image with the Sobel
// operator using Intel(R) Integrated Primitives (Intel(R) IPP) functions:
// ippiGradientVectorGetBufferSize
// ippiGradientVectorSobel_8u16s_C3C1R
#include <stdio.h>
#include "ipp.h"
#define WIDTH 8 /* source image width */
#define HEIGHT 4 /* source image height */
#define ROI_WIDTH 8 /* source image ROI width */
#define ROI_HEIGHT 4 /* source image ROI height */
#define NUMCHN 1 /* number of channels */
/* 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 */
static Ipp8u pSrc[(NUMCHN * WIDTH + 1)* HEIGHT] = /* Pointer to source image */
{ 1, 2, 3, 4, 8, 8, 8, 8,
1, 2, 3, 4, 8, 8, 8, 8,
1, 2, 3, 4, 8, 8, 8, 8,
1, 2, 3, 4, 8, 8, 8, 8 };
/* 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;
int srcStep = WIDTH*NUMCHN; /* Steps, in bytes, through the source images */
Ipp8u* psrc = pSrc + 1*srcStep + 1 * NUMCHN; /* Pointer to source ROI image */
IppiSize roiSize = { ROI_WIDTH, ROI_HEIGHT }; /* Size of source ROI in pixels */
Ipp16s pGx[4 * 7], pGy[4 * 7]; /* Define x and y gradient components */
int gxStep = 4 * sizeof(Ipp16s), gyStep = 4 * sizeof(Ipp16s);/* Steps through the X and Y component image */
Ipp8u* pBuffer = NULL; /* Pointer to the work buffer */
Ipp8u borderValue = 0;
int bufferSize = 0;
Ipp16s pMag[ROI_WIDTH*ROI_HEIGHT]; /* Pointer to the magnitude of computed gradient */
int magStep = ROI_WIDTH*sizeof(Ipp16s); /* Step through the magnitude image */
Ipp32f pAngle[ROI_WIDTH*ROI_HEIGHT]; /* Pointer to the angle of computed gradient */
int angleStep = ROI_WIDTH*sizeof(Ipp32f);/* Step through the magnitude image */
IppiMaskSize maskSize = ippMskSize3x3;
IppiBorderType borderType = ippBorderConst;
check_sts( status = ippiGradientVectorGetBufferSize(roiSize, maskSize, ipp8u, NUMCHN, &bufferSize) )
pBuffer = ippsMalloc_8u(bufferSize);
/* Compute gradient using 3x3 Sobel operator (source ROI at point x=1, y=1) */
check_sts( status = ippiGradientVectorSobel_8u16s_C1R(psrc, srcStep, pGx, gxStep, pGy, gyStep,
pMag, magStep, pAngle, angleStep, roiSize, maskSize, ippNormL2, borderType, borderValue, pBuffer) )
EXIT_MAIN
ippsFree(pBuffer);
printf("Exit status %d (%s)\n", (int)status, ippGetStatusString(status));
return (int)status;
}