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Hi all, recently I had to detect and measure the holes of a prehistoric engraving called in French "cupules", these are holes done by prehistoric men larger than holes called "négatifs d'éclats". This is an explanatory diagram : http://sylvain-ard.fr/temp/l%c3%a9gendePourSylvain.jpg and this is an image to treat : http://sylvain-ard.fr/temp/DSCF4019.JPG These images are of poor quality, I know, but they are those sended by the archaeologist. There are 7 cupules on the image. I tried to do an Otsu binarization and then to slip a complicated mask formed by circles and segments which must be even white or black and verify on each pixel of the image if the mask match a "cupule", but it doesn't work, it is not the good method. If you have a better method I will be happy. Thank you very much Best regards

Hi all, recently I had to detect and measure the holes of a prehistoric engraving called in French "cupules", these are holes done by prehistoric men larger than holes called "négatifs d'éclats". This is an explanatory diagram : http://sylvain-ard.fr/temp/l%c3%a9gendePourSylvain.jpg and this is an image to treat : http://sylvain-ard.fr/temp/DSCF4019.JPG These images are of poor quality, I know, but they are those sended by the archaeologist. There are 7 cupules on the image. I tried to do an Otsu binarization and then to slip a complicated mask formed by circles and segments which must be even white or black and verify on each pixel of the image if the mask match a "cupule", but it doesn't work, it is not the good method. If you have a better method I will be happy. Thank you very much Best regards