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Of course, here it is, circles were made by hand, that is what i want to automate since i will have hundreds of images to analyze

Open CV should compute the circles on grain corners, output the original image with circles overlay, then do some simple maths

Average diameter of the circles (1 to 16) = 36 px Diameter of biggest inscribed circle (17) = 273 px

Roundness = 36/273 = 0,13