Hello, I'm trying to identify filled circles from non-filled circles (example pic - http://bit.ly/17bvGcS )
circle-filled.jpg circle-empty.jpg
How do I go about doing this?0
I tried searching, and found this page on Image Moments, however, the code as shown in the example doesn't work for me.
I'm using OpenCV 2.6.4 in a Visual Studio 2012 C++ Environment.
You can use hough-transform for detecting the circle and if it's a binary images then countNonZero to check if the circle is filled. Otherwise, you can use a histogram of gray values to measure the amount of black/white pixels.
I recommend to stick with your previous link to find contours of OpenCV. the moment helps you to find the center only.
simpler tutorial for contours : http://docs.opencv.org/doc/tutorials/imgproc/shapedescriptors/find_contours/find_contours.html
Use the FindContours method with CV_RETR_TREE option that option with give you a tree of contours inside a contours. if there's a contour within a contour. it seems to be a non-filled circle.
Asked: 2013-10-21 07:01:24 -0600
Seen: 5,671 times
Last updated: Oct 21 '13
