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find circles image processing using -'java,opencv,image-processing,circle,hough-transform'


find circles image processing  using -'java,opencv,image-processing,circle,hough-transform'

I'm using opencv and java to find circles on an image, I have the image below so far.
I'm using Hough to find the circles with the code like this:

    Imgproc.medianBlur(result, result, 3);
    Imgproc.medianBlur(result, result, 3);
    Imgproc.medianBlur(result, result, 3);
    Mat circles = new Mat();
    Imgproc.HoughCircles(result, circles, Imgproc.CV_HOUGH_GRADIENT, 1, 1, 200, 100, 30, 40);
    System.out.println(circles.dump());


But I get an empty Mat for result with and without the blur.
How should I fix this code?



EDIT :
Hi guys!

Thanks to you I have this picture now. I'm using these parameters:

Imgproc.HoughCircles(result, circles, Imgproc.CV_HOUGH_GRADIENT, 1, 20, 50, 10, 10, 40);


I'm still using the medianBlur before the detection.

The only question left is why does it detect these small circles? I've attached the result of the canny detection, I think the circles are pretty seeable .



    
asked Sep 7, 2015 by rajesh
0 votes
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