Technical Report Number
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.
Dartmouth Digital Commons Citation
Farid, Hany, "Digital Image Ballistics from JPEG Quantization" (2006). Computer Science Technical Report TR2006-583. https://digitalcommons.dartmouth.edu/cs_tr/291