1. A computer-implemented method for extracting financial card information from multiple cards, comprising: identifying, by the one or more computing devices, one or more quadrilaterals formed by a plurality of intersections of lines from an image of a plurality of cards; determining, by the one or more computing devices, a corresponding aspect ratio for each of the quadrilaterals; comparing, by the one or more computing devices, the determined aspect ratios for each of the quadrilaterals to an expected aspect ratio, the expected aspect ratio being based at least in part on a type of card represented in the image; identifying, by the one or more computing devices, one or more particular quadrilaterals that match the expected aspect ratio; and performing, by the one or more computing devices, an optical character recognition algorithm on each of the particular quadrilaterals to extract financial card information from each quadrilateral.