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