I have trained a DL model to segment grains objects, using cv2.findContours I could also calculate pixel area of segmented objects, is there a way to also estimate weight of segmented objects ?

weight?

no, that’s not a visual property.

best you can hope for is to use the visual information you have, and assume some spherical shape that fits, and make assumptions about density.

and then you’d have to calibrate, i.e. see what the algorithm says, then weigh the corns, and find a mathematical relationship to compensate for the visual algorithm’s error.

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