Determining the metal alloy of coin involves comparing color values with reference color values corresponding to different metal alloys, associating with metal alloy if difference is less than defined amount

摘要

The method involves illuminating at least one region of the coin (10) with light, displaying an image of the region, determining a sub-image with color values similar to the reflected light, displaying the image of a color model in the sub-image and dividing it into two independent color values of the color model, averaging each color value, comparing with a set of reference color values corresponding to different metal alloys and associating with a metal alloy if the difference is less than a defined amount.