1. A payment document classification system, comprising: a communication unit which receives an image of a payment document captured by a mobile device; a preprocessing unit which extracts at least one feature from the image; a comparison unit which compares the at least one extracted feature with at least one known feature of a payment document type to determine a likelihood that the payment document matches the at least one payment document type; and a classification unit which classified the payment document as at least one payment document type based on the likelihood that the payment document matches the at least one payment document type.