Eextending Faster R-CNN Algorithm for Object Detection

Hello,

My project is to detect bullet hits on a dartboard like target and creating a code to score the bullet hits according to their location on the target (each ring in the target image corresponds to a different score). We used the Faster R-CNN Algorithm for Object Detection model (by referring the link: https://www.analyticsvidhya.com/blog/2018/11/implementation-faster-r-cnn-python-object-detection/). But I cannot understand that how can I write a code that will both detect the location of the bullet hits within the rings and then score those bullet hits.
Appreciate any help. Thank you
https://drive.google.com/open?id=17D5fFTvuXwqM5_HP9AeteXIQQAGSHBkK

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