BIB-VERSION:: CS-TR-v2.0
ID:: ncstrl.dartmouthcs//TR2008-638
ENTRY:: December 24, 2008
ORGANIZATION:: Dartmouth College, Computer Science
REQUESTED-BY:: farid@cs.dartmouth.edu
REQUESTED-FOR:: farid@cs.dartmouth.edu
REQUESTED-DATE:: Thu Dec 11 14:13:23 EST 2008
TITLE:: Digital Image Ballistics from JPEG Quantization: A Followup Study
TYPE:: Technical Report (paper)
REVISION:: 1
AUTHOR:: Farid, Hany
DATE:: December 2008
RETRIEVAL:: For a paper copy, email <reports@cs.dartmouth.edu>
RETRIEVAL:: For a paper copy, write to
       Technical Report Librarian
       Department of Computer Science
       Dartmouth College
       6211 Sudikoff Laboratory
       Hanover, NH 03755-3510
       USA
RETRIEVAL:: PDF at http://www.cs.dartmouth.edu/reports/TR2008-638.pdf
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.
END:: ncstrl.dartmouthcs//TR2008-638