Android Question OCR but just questionnaire boxes marks

Hello everyone!
There are quite a few topics on the forum about OCR, but it is the text that is recognized there. I need to recognize not text, but only marks in questionnaires, whether there is a mark or not. The format and text of the questionnaire is precisely known in advance, it is not necessary to recognize it. It is necessary to recognize only an empty box and a box with a mark.
Perhaps someone faced a similar problem?
 
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