10. The method of claim 9 , wherein the at least one extracted feature is a location of a lock icon.
9. A method of classifying a payment document, comprising: receiving an image of a payment document captured by a mobile device; extracting at least one feature from the image; comparing 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, wherein comparing further includes comparing a plurality of extracted features with a plurality of known features in a series, starting with an extracted feature which requires the least computation time of the plurality of extracted features; and classifying 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.