/* This is a standalone program. Pass an image name as a first parameter of the program.

   Switch between standard and probabilistic Hough transform by changing "#if 1" to "#if 0" and back */

#include <cv.h>
#include <highgui.h>
#include <math.h>

#pragma comment( lib, "cv.lib" )   
 

#pragma comment( lib, "cxcore.lib" )   
#pragma comment( lib, "highgui.lib" )   

int main(int argc, char** argv)
{
    const char* filename = argc >= 2 ? argv[1] : "wind.png";
    IplImage* src = cvLoadImage( filename, 0 );
    IplImage* dst;
    IplImage* color_dst;
    CvMemStorage* storage = cvCreateMemStorage(0
 
);
    CvSeq* lines = 0;
    int i;
    if( !src )
	{
        return -1;
	}
    dst = cvCreateImage( cvGetSize(src), 8, 1 );
    color_dst = cvCreateImage( cvGetSize(src), 8, 3 );
    cvCanny( src, dst, 50, 200, 3 );
    cvCvtColor( dst, color_dst, CV_GRAY2BGR );
#if 0
    lines = cvHoughLines2(dst, storage, CV_HOUGH_STANDARD, 1
 
, CV_PI/180, 100, 0, 0);
    for(i = 0; i < MIN(lines->total,100); i++)
    {
        float* line = (float*)cvGetSeqElem(lines,i);
        float rho = line[0];
        float theta = line[1];
        CvPoint pt1, pt2;
        double a = cos(theta), b = sin(theta);
        double x0 = a*rho, y0 = b*rho;
        pt1.x = cvRound(x0 + 1000*(-b));
        pt1.y = cvRound(y0 + 1000*(a));
        pt2.x = cvRound(x0 - 1000*(-b));
        pt2.y = cvRound(y0 - 1000*(a));
        cvLine(color_dst, pt1, pt2, CV_RGB(255,0,0), 3, CV_AA, 0);
    }
#else
    lines = cvHoughLines2(dst, storage, CV_HOUGH_PROBABILISTIC, 1, CV_PI/180, 50, 50, 10);
    for (i = 0; i < lines->total; i++)
    {
        CvPoint* line = (CvPoint*)cvGetSeqElem(lines, i);
        cvLine(color_dst, line[0], line[1], CV_RGB(255, 0, 0), 3, CV_AA, 0);
    }
#endif

    cvNamedWindow( "Source", 1 );
    cvShowImage( "Source", src );
    cvNamedWindow( "Hough", 1 );
    cvShowImage( "Hough", color_dst );
    cvWaitKey(0);

    return 0;
}

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OpenCV檢測直線