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Abstract: The lossy JPEG compression scheme employs a quantization table that controls the amount of compression achieved. Because 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. This report describes the analysis of quantization tables extracted from 1,000,000 images downloaded from Flickr.com.

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   Hany Farid, "Digital Image Ballistics from JPEG Quantization: A Followup Study." Dartmouth Computer Science Technical Report TR2008-638, December 2008.

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