1 #define CV_NO_BACKWARD_COMPATIBILITY
3 /* This is a standalone program. Pass an image name as a first parameter of the program.
4 Switch between standard and probabilistic Hough transform by changing "#if 1" to "#if 0" and back */
9 int main(int argc, char** argv)
11 const char* filename = argc >= 2 ? argv[1] : "pic1.png";
12 IplImage* src = cvLoadImage( filename, 0 );
15 CvMemStorage* storage = cvCreateMemStorage(0);
22 dst = cvCreateImage( cvGetSize(src), 8, 1 );
23 color_dst = cvCreateImage( cvGetSize(src), 8, 3 );
25 cvCanny( src, dst, 50, 200, 3 );
26 cvCvtColor( dst, color_dst, CV_GRAY2BGR );
28 lines = cvHoughLines2( dst, storage, CV_HOUGH_STANDARD, 1, CV_PI/180, 100, 0, 0 );
30 for( i = 0; i < MIN(lines->total,100); i++ )
32 float* line = (float*)cvGetSeqElem(lines,i);
34 float theta = line[1];
36 double a = cos(theta), b = sin(theta);
37 double x0 = a*rho, y0 = b*rho;
38 pt1.x = cvRound(x0 + 1000*(-b));
39 pt1.y = cvRound(y0 + 1000*(a));
40 pt2.x = cvRound(x0 - 1000*(-b));
41 pt2.y = cvRound(y0 - 1000*(a));
42 cvLine( color_dst, pt1, pt2, CV_RGB(255,0,0), 3, CV_AA, 0 );
45 lines = cvHoughLines2( dst, storage, CV_HOUGH_PROBABILISTIC, 1, CV_PI/180, 50, 50, 10 );
46 for( i = 0; i < lines->total; i++ )
48 CvPoint* line = (CvPoint*)cvGetSeqElem(lines,i);
49 cvLine( color_dst, line[0], line[1], CV_RGB(255,0,0), 3, CV_AA, 0 );
52 cvNamedWindow( "Source", 1 );
53 cvShowImage( "Source", src );
55 cvNamedWindow( "Hough", 1 );
56 cvShowImage( "Hough", color_dst );