![](/Images/OutliningIndicators/ExpandedBlockStart.gif)
/**//* 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>
![](/Images/OutliningIndicators/None.gif)
int main(int argc, char** argv)
![](/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](/Images/OutliningIndicators/ContractedBlock.gif)
{
IplImage* src;
src=cvLoadImage("1.bmp",-1);
IplImage* dst = cvCreateImage( cvGetSize(src), 8, 1 );
IplImage* color_dst = cvCreateImage( cvGetSize(src), 8, 3 );
CvMemStorage* storage = cvCreateMemStorage(0);
CvSeq* lines = 0;
int i;
IplImage* src1=cvCreateImage(cvSize(src->width,src->height),IPL_DEPTH_8U,1);
![](/Images/OutliningIndicators/InBlock.gif)
cvCvtColor(src, src1, CV_BGR2GRAY);
// cvCopy(src,src1);
cvCanny( src1, dst, 50, 200, 3 );
![](/Images/OutliningIndicators/InBlock.gif)
cvCvtColor( dst, color_dst, CV_GRAY2BGR );
#if 0
lines = cvHoughLines2( dst, storage, CV_HOUGH_STANDARD, 1, CV_PI/180, 150, 0, 0 );
![](/Images/OutliningIndicators/InBlock.gif)
for( i = 0; i < lines->total; i++ )
![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
float* line = (float*)cvGetSeqElem(lines,i);
float rho = line[0];
float theta = line[1];
CvPoint pt1, pt2;
double a = cos(theta), b = sin(theta);
if( fabs(a) < 0.001 )
![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
pt1.x = pt2.x = cvRound(rho);
pt1.y = 0;
pt2.y = color_dst->height;
}
else if( fabs(b) < 0.001 )
![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
pt1.y = pt2.y = cvRound(rho);
pt1.x = 0;
pt2.x = color_dst->width;
}
else
![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
pt1.x = 0;
pt1.y = cvRound(rho/b);
pt2.x = cvRound(rho/a);
pt2.y = 0;
}
cvLine( color_dst, pt1, pt2, CV_RGB(255,0,0), 3, 8 );
}
#else
lines = cvHoughLines2( dst, storage, CV_HOUGH_PROBABILISTIC, 1, CV_PI/180, 80, 30, 10 );
for( i = 0; i < lines->total; i++ )
![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
CvPoint* line = (CvPoint*)cvGetSeqElem(lines,i);
cvLine( color_dst, line[0], line[1], CV_RGB(255,0,0), 3, 8 );
}
#endif
cvNamedWindow( "Source", 1 );
cvShowImage( "Source", src );
![](/Images/OutliningIndicators/InBlock.gif)
cvNamedWindow( "Hough", 1 );
cvShowImage( "Hough", color_dst );
![](/Images/OutliningIndicators/InBlock.gif)
cvWaitKey(0);
}
![](/Images/OutliningIndicators/None.gif)