1. A method comprising: receiving a first image, wherein the first image is a digital image of a front surface of a document; receiving a second image, wherein the second image is a digital image of a rear surface of the document; identifying defects in the first image that could hinder use of the first image and the second image to process the document in an automated document processing system; identifying defects in the second digital image that could hinder use of the first image and the second image to process the document in the automated document processing system; determining whether a first defect corresponds to any of the defects in the second image, wherein the first defect is one of the identified defects in the first image; and outputting data that indicates that the first image and the second image include a defect that could hinder use of the first image and the second image in the automated document processing system when the first defect corresponds to one of the defects in the second image.