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I am a newbee with big N. I am trying to explore if it is possible to use openCV for detecting holes in my paper target when practice shooting. I have started with the SimpleBlobDetection and that one works fine with some "tweaking" for calibers over .22 beacuse you get bigger circles with more defined edges if you use .357 or .44. However! For .22 you do not get so defined edges and big contrast. I have looked through the Q&A here like "Recognize basic shapes in binarized image", "Colour + Contour Detection" and "Cell detection improvement" but I cannot egt the n"final" solution from this. Any ideas on how to address it more empirically ? See my example image with .22 cal (this is worst case example). Thanx. C:\fakepath\blob3.jpg

I am a newbee with big N. I am trying to explore if it is possible to use openCV for detecting holes in my paper target when practice shooting. I have started with the SimpleBlobDetection and that one works fine with some "tweaking" for calibers over .22 beacuse you get bigger circles with more defined edges if you use .357 or .44. However! For .22 you do not get so defined edges and big contrast. I have looked through the Q&A here like "Recognize basic shapes in binarized image", "Colour + Contour Detection" and "Cell detection improvement" but I cannot egt the n"final" solution from this. Any ideas on how to address it more empirically ? See my example image with .22 cal (this is worst case example). Thanx. C:\fakepath\blob3.jpgThanx.

Update! I have added better images that is more "clean"