Detecting double compressed JPEG images

Verifying the integrity of digital images and detecting the traces of tampering without using any protecting pre-extracted or pre-embedded information has an important role in image forensics and crime detection. When altering a JPEG image, typically it is loaded into a photo-editing software and after manipulations are carried out, the image is re-saved. This operation, typically, brings into the image specific artifacts. In this paper we focus on these artifacts and propose an automatic method capable of detecting them.