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Merge pull request #4112 from sturkmen72:patch-1

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This commit is contained in:
Vadim Pisarevsky 2015-06-16 12:18:13 +00:00
commit 0c67c6c136
1 changed files with 6 additions and 2 deletions
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8
modules/imgproc/include/opencv2/imgproc.hpp
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@ -1689,6 +1689,7 @@ See the line detection example below:
#include <opencv2/highgui.hpp>
using namespace cv;
using namespace std;
int main(int argc, char** argv)
{
@ -1774,18 +1775,19 @@ Example: :
#include <math.h>
using namespace cv;
using namespace std;
int main(int argc, char** argv)
{
Mat img, gray;
if( argc != 2 && !(img=imread(argv[1], 1)).data)
if( argc != 2 || !(img=imread(argv[1], 1)).data)
return -1;
cvtColor(img, gray, COLOR_BGR2GRAY);
// smooth it, otherwise a lot of false circles may be detected
GaussianBlur( gray, gray, Size(9, 9), 2, 2 );
vector<Vec3f> circles;
HoughCircles(gray, circles, HOUGH_GRADIENT,
2, gray->rows/4, 200, 100 );
2, gray.rows/4, 200, 100 );
for( size_t i = 0; i < circles.size(); i++ )
{
Point center(cvRound(circles[i][0]), cvRound(circles[i][1]));
@ -1797,6 +1799,8 @@ Example: :
}
namedWindow( "circles", 1 );
imshow( "circles", img );
waitKey(0);
return 0;
}
@endcode