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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.
Bibliographic citation for this report: [plain text] [BIB] [BibTeX] [Refer]
Or copy and paste:
Hany Farid, "Digital Image Ballistics from JPEG Quantization." Dartmouth Computer Science Technical Report TR2006-583, September 2006.
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