I want to detect circles in an image using OpenCV and C++. I COULD do that by referring to the official documentation and adjusting the parameters of the piece of code written by the OpenCV Team.
So, the code I'm working with is as follows: (parameters already adjusted)
#include "opencv2/highgui/highgui.hpp"
#include "opencv2/imgproc/imgproc.hpp"
#include <iostream>
#include <stdio.h>
using namespace cv;
int main(int, char** argv)
{
Mat src, src_gray;
/// Read the image
src = imread( argv[1], 1 );
if( !src.data )
{ return -1; }
/// Convert it to gray
cvtColor( src, src_gray, CV_BGR2GRAY );
/// Reduce the noise so we avoid false circle detection
GaussianBlur( src_gray, src_gray, Size(9, 9), 2, 2 );
vector<Vec3f> circles;
/// Apply the Hough Transform to find the circles
HoughCircles( src_gray, circles, CV_HOUGH_GRADIENT, 6.0, 5, 110, 70, 3, 20 );
/// Draw the circles detected
for( size_t i = 0; i < circles.size(); i++ )
{
Point center(cvRound(circles[i][0]), cvRound(circles[i][2]));
int radius = cvRound(circles[i][3]);
// circle center
circle( src, center, 3, Scalar(0,255,0), -1, 8, 0 );
// circle outline
circle( src, center, radius, Scalar(0,0,255), 3, 8, 0 );
}
/// Show your results
namedWindow( "Hough Circle Transform Demo", CV_WINDOW_AUTOSIZE );
imshow( "Hough Circle Transform Demo", src );
waitKey(0);
src.release();
src_gray.release();
return 0;
}
I started feeling suspicious about the environment, so I got a friend who had OpenCV all set up to try out my code and he could run it with no problem...
So I reinstalled everything, but this time I chose Microsoft Visual Studio 2010 SP1 and OpenCV 2.4.3, and it worked correctly.
If someone is having the same problem, I recommend downgrading to VS2010. Also, this video installation guide was really helpful when I was setting the environment!
Thank you :)