@TechReport{Dartmouth:TR2006-583,
  author = {Hany Farid},
  title = {{Digital Image Ballistics from JPEG Quantization}},
  institution = {Dartmouth College, Computer Science},
  address = {Hanover, NH},
  number = {TR2006-583},
  year = {2006},
  month = {September},
  URL = {http://www.cs.dartmouth.edu/reports/TR2006-583.pdf},
  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.
  }
}