%T Digital Image Ballistics from JPEG Quantization
%A Hany Farid
%R Technical Report TR2006-583
%I Dartmouth College, Computer Science
%C Hanover, NH
%D September 2006
%U http://www.cs.dartmouth.edu/reports/TR2006-583.pdf
%X
 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.