How to evaluate optical circle which are filled?

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Sabanam
Sabanam 2017-4-28
回答： Image Analyst 2017-4-28
I am working on OMR(optical mark recognition) evaluation system where i am getting subjective area(ROI) after scanned image processing. As bubble matrix is 10*10, length of the roll number is some fix constant, how can i make logic to evaluate filled circle? How can i differentiate circle and other object inside image?

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Image Analyst
Image Analyst 2017-4-28
See my attached demo. Adapt as needed, like first cropping off handwriting, if necessary.

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