Abstract: Resampling detection has become a standard tool in digital image forensics. This paper investigates the important case of resampling detection in re-compressed JPEG images. We show how blocking artifacts of the previous compression step can help to increase the otherwise drastically reduced detection performance in JPEG compressed images. We give a formulation on how affine transformations of JPEG compressed images affect state-of-the-art resampling detectors and derive a new efficient detection variant, which better suits this relevant detection scenario. The principal appropriateness of using JPEG pre-compression artifacts for the detection of resampling in re-compressed images is backed with experimental evidence on a large image set and for a variety of different JPEG qualities.

  author       = {Matthias Kirchner and Thomas Gloe},
  url          = {http://dud.inf.tu-dresden.de/~kirchner/Documents/WIFS09_slides.pdf},
  year         = {2009},
  pages        = {21--25},
  address      = {London, UK},
  title        = {On resampling detection in re-compressed images},
  booktitle    = {Proceedings of the 2009 First IEEE International Workshop on Information Forensics and Security},