just my $0.02
It might be challenging, for various reasons, to run the process using digital images (smartphone photos). I think the only fail-proof way to electronically authenticate a card would be to develop a system that uses a 3D scanner to get all sides and edges of the card, with absolutely precise measurements all around.
This would involve the 3D scanning device taking both photos and measurements of the card, and then sending the scanned information to a PC application. The PC application would then process all the measurements and other photo data (common print marks, coloring, fonts, etc) against a database of card attributes for the given set.
Of course, you would need to have the actual card physically available, to be able to place it in the scanner. There are just too many variables involved with using digital images of cards.
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