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I think comparing edges only may be the key (excellent link, JoshuaD). The edges should capture the features of the coins being compared. Simply comparing images will not work - here's why.
The actual (raised) features of the coin - a capital "I" followed by a capital "T".
Here's how the coin would photograph lit from the lower left. Legend: "+" for the metal's "normal" color, "_" for highlights, and "#" for shadows.
Here's how the coin would photograph lit from the lower right.
And here's how it would photograph lit dead on.
The edges for all three images would (I think) all look like the last image. In reply to Re: Re: comparing two images and detecting differences
by bean
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