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filled circle detection

Hello, I'm trying to identify filled circles from non-filled circles (example pic - )

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.