Unexpected Artefacts in PRNU-Based Camera Identification: A "Dresden Image Database" Case-Study
Title | Unexpected Artefacts in PRNU-Based Camera Identification: A "Dresden Image Database" Case-Study |
Publication Type | Conference Paper |
Year of Publication | 2012 |
Authors | Gloe, T., Pfennig S., & Kirchner M. |
Page(s) | 109-114 |
Other Numbers | 3368 |
Abstract | Although sensor noise is generally known as a very reliablemeans to uniquely identify digital cameras, care has to betaken with respect to camera model characteristics thatmay cause false accusations. While earlier reports focusedon so-called linear patterns with a regular grid structure,also distortions due to geometric corrections of radial lensdistortion have recently gained interest. Here, we reportobservations from a case study with the `Dresden ImageDatabase' that revealed further artefacts. We found diagonalline artefacts in Nikon CoolPix S710 sensor noise, as wellas non-trivial dependencies between sensor noise, exposuretime (FujiFilm J50) and focal length (Casio EX-Z150). Atslower shutter speeds, original J50 images exhibit a slighthorizontal shift, whereas EX-Z150 images exhibit irregulargeometric distortions, which depend on the focal lengthand which become visible in the p-map of state-of-the-artresampling detectors. The observed artefacts may providevaluable clues for camera model identication, but also callfor particular attention when creating reference noise patternsfor applications that require low false negative rates. |
Acknowledgment | This work was partially funded by the Deutscher Akademischer Austausch Dienst (DAAD) through a postdoctoral fellowship. |
URL | http://www.icsi.berkeley.edu/pubs/vision/ICSI_artefacts12.pdf |
Bibliographic Notes | Proceedings of the ACM Multimedia and Security Workshop (MM&Sec 2012), pp. 109-114, Coventry, United Kingdom |
Abbreviated Authors | T. Gloe, S. Pfennig, and M. Kirchner |
ICSI Research Group | Vision |
ICSI Publication Type | Article in conference proceedings |