no result after hough filter

Question

In the program I use a canny filter like this:

circles = cv2.HoughCircles(cannyresult,cv2.cv.CV_HOUGH_GRADIENT,1,10)
    if circles is None:
        print'no '

Then the terminal prints no which means there is no result back, and the cannyresult is a picture with a lot of circles. Can someone help me on this please?

Answer 1

It's all about parameters, it always is. The parameters used in HoughCircles play a fundamental role.

I wish I could help you more, but without an input image to work with my hands are tied. The last reference I shared with you provides links to other answers with actual source code that demonstrates the importance of tweaking the function parameters until they work for you.