Graph Generation and Total Variation Forensics For JPEG Compression

Abstract

The widespread availability of photo editing software has made it easy to create visuallyconvincing digital
image forgeries. The field of anti-forensics seeks to developa set of techniques designed to fool current forensic
methodologies. There exists atechnique for disguising an images JPEG compression history. An image’s JPEGcompression
history can be used to provide evidence of image manipulation, supplyinformation about the camera used to generate an
image, and identify forged regionswithin an image. The technique includes proper addition of noise to an imagesdiscrete
cosine transform coefficients which can sufficiently remove quantization artifacts,acts as indicators of JPEG compression
while introducing an acceptable levelof distortion. A forensic analyst is able to counter above technique by using
totalvariation concept of signal.