/*
// Copyright 2015 2016 Intel Corporation All Rights Reserved.
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*/
// A simple example of detecting lines in the source image using
// the probabilistic Hough transform using Intel IPP functions:
// ippiHoughProbLineGetSize_8u_C1R
// ippiHoughProbLineInit_8u32f_C1R
// ippiHoughProbLine_8u32f_C1R
#include <stdio.h>
#include "ipp.h"
#define WIDTH 800 /* image width */
#define HEIGHT 600 /* 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 IPP function returned status different from ippStsNoErr */
/* Results of ippMalloc() are not validated because Intel(R) Integrated Performance Primitives functions perform bad arguments check and will return an appropriate status */
int main(void)
{
int i = 0;
IppStatus status = ippStsNoErr;
Ipp8u* pSrc = NULL; /* Pointers to source images */
int srcStep = 0; /* Steps, in bytes, through the source images */
IppiSize roiSize = { WIDTH, HEIGHT }; /* Size of source ROI in pixels */
int bufferSize = 0, specSize = 0;/* Size of the working buffer and spec structure */
Ipp8u *pBuffer = NULL;
IppiHoughProbSpec* pSpec = NULL;
IppiPoint pLineP[128]; /* Pointer to output array of detected lines */
int threshold = 20, lineLength = 40, ineGap = 4, maxLineCount = 128;
IppPointPolar delta = { 1, (Ipp32f)IPP_PI / 180.f / 3.f }; /* Step of discretization */
int lineCount = 0; /* Number of detected lines. */
pSrc = ippiMalloc_8u_C1(roiSize.width, roiSize.height, &srcStep);
check_sts( status = ippiSet_8u_C1R(0, pSrc, srcStep, roiSize) ) /* Zero image */
for (i = 0; i<70; i++) { /* Draw line (100,100)-(170,170) */
pSrc[(i + 100)*srcStep + i + 100] = 255;
}
/* Compute the size of the working buffer and spec structure */
check_sts( status = ippiHoughProbLineGetSize_8u_C1R(roiSize, delta, &specSize, &bufferSize) )
pBuffer = (Ipp8u*)ippsMalloc_8u(bufferSize);
pSpec = (IppiHoughProbSpec*)ippsMalloc_8u(specSize);
/* Initialize the specification structure */
check_sts( status = ippiHoughProbLineInit_8u32f_C1R(roiSize, delta, ippAlgHintNone, pSpec) )
/* Detect lines in the source image using the probabilistic Hough transform. */
check_sts( status = ippiHoughProbLine_8u32f_C1R(pSrc, srcStep, roiSize, threshold, lineLength, ineGap, pLineP, maxLineCount, &lineCount, pBuffer, pSpec) )
EXIT_MAIN
ippsFree(pBuffer);
ippiFree(pSrc);
ippsFree(pSpec);
printf("Exit status %d (%s)\n", (int)status, ippGetStatusString(status));
return (int)status;
}