In one embodiment, a method includes receiving, at a mobile device, an image depicting a document; attempting to classify, using a processor of the mobile device, the document depicted in the image to one of a plurality of predetermined document classes, wherein attempting to classify the document results in an ambiguous classification result; determining, using the mobile device, location information identifying a geographic location of the mobile device at a particular time; and disambiguating, using the processor of the mobile device, the ambiguous classification result based on the location information. Exemplary systems and computer program products are also described.