Technical Report Number
Photos are commonly falsified by compositing two or more people into a single image. We describe how such composites can be detected by estimating a camera's intrinsic parameters. Differences in these parameters across the image are then used as evidence of tampering. Expanding on earlier work, this approach is more applicable to low-resolution images, but requires a reference image of each person in the photo as they are directly facing the camera. When considering composites of famous people, such a reference photo is easily obtained from an on-line image search.
Dartmouth Digital Commons Citation
Kee, Eric and Farid, Hany, "Detecting Photographic Composites of Famous People" (2010). Computer Science Technical Report TR2009-656. https://digitalcommons.dartmouth.edu/cs_tr/329