Paper Info
Title
Near optimal detection of quantized signals and application to JPEG forensics
Abstract
In this paper, we investigate the problem of deciding whether a multidimensional signal has been quantized according to a given lattice or not. Under an infinite variance assumption, we derive the expression of the optimal detector, together with a practical approximation formula based on multidimensional Fourier series. As a forensic case study, the proposed detector is applied to the detection of nonaligned double JPEG compression. Results on both synthetic signals and real JPEG images show interesting properties of the proposed detector. Namely, the detector outperforms existing state-of-art detectors for nonaligned double JPEG compression. The application of the proposed scheme to other forensic problems seems a natural extension of this work.
Year
DOI
Venue
2013
10.1109/WIFS.2013.6707813
Information Forensics and Security
Keywords
DocType
ISSN
image coding,image forensics,quantisation (signal),JPEG forensics,double JPEG compression,multidimensional Fourier series,multidimensional signal,near optimal detection,optimal detector,quantized signals,real JPEG images,synthetic signals
Conference
2157-4766
Citations 
PageRank 
References 
3
0.40
7
Authors
3
Name
Order
Citations
PageRank
Tiziano Bianchi1100362.55
Alessandro Piva22231157.21
Fernando Pérez-González372793.38