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How many cards are in your collection? Have you masked you cards so that you only match the image in the upper part of the card and not the whole card? The border is always similar so that it can't be used to discriminate.
Do you have any sample images? Or visualizations of false positives.
Have you checked the Bag of Word implementations? One important paper is http://www.vis.uky.edu/~stewe/publications/nister_stewenius_cvpr2006.pdf
