Abstract: Most digital cameras export images in the JPEG file format. This lossy compression scheme employs a quantization table that controls the amount of compression achieved. Different cameras typically employ different tables. A comparison of an image's quantization scheme to a database of known cameras affords a simple technique for confirming or denying an image's source. Similarly, comparison to a database of photo-editing software can be used in a forensic setting to determine if an image was edited after its original recording.
@techreport{farid08-1,
url = {http://www.cs.dartmouth.edu/farid/publications/tr08.pdf},
author = {Hany Farid},
number = {TR2008-638},
year = {2008},
title = {Digital image ballistics from \protect{JPEG} quantization: a followup study},
institution = {Department of Computer Science, Dartmouth College},
}