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Title: A robust JPEG compression detector for image forensics
Authors: Kumawat C.
Pankajakshan, Vinod
Published in: Signal Processing: Image Communication
Abstract: Identification of JPEG compressed images saved in uncompressed format (JPEG-U images) is an important issue in forensic analysis. The state-of-the-art JPEG compression detection methods fail to identify such images when subjected to post-processing/anti-forensic operations. In this paper, we propose a novel JPEG compression detector which is robust to post-processing and anti-forensic operations. The detector is based on the difference in the discrete cosine transform (DCT) coefficient distributions in the ac subbands of uncompressed images and JPEG-U images. We show theoretically and empirically that the probability of subband DCT coefficients which lie in the interval (−0.5,0.5) is significantly different for a JPEG-U and the corresponding uncompressed image. This difference is exploited to derive a detection statistic which is compared with a threshold to detect JPEG-U images. The detector makes use of calibration, a technique used in steganalysis, to obtain the detection statistic. The experimental results show that the proposed detector significantly outperforms the state-of-the-art detectors, especially in the presence of post-processing and anti-forensic operations.
Citation: Signal Processing: Image Communication(2020), 89
Issue Date: 2020
Publisher: Elsevier B.V.
Keywords: Calibration
JPEG anti-forensics
JPEG compression artifacts
JPEG forensics
Digital forensics
Discrete cosine transforms
Detection methods
Detection statistic
Discrete cosine transform coefficient distributions
Forensic analysis
JPEG compressed images
JPEG compression
State of the art
Uncompressed images
ISSN: 9235965
Author Scopus IDs: 57201898896
Author Affiliations: Kumawat, C., Department of Electronics & Communication Engineering, Indian Institute of Technology Roorkee, Roorkee, 247667, India
Pankajakshan, V., Department of Electronics & Communication Engineering, Indian Institute of Technology Roorkee, Roorkee, 2
Funding Details: All persons who have made substantial contributions to the work reported in the manuscript (e.g. technical help, writing and editing assistance, general support), but who do not meet the criteria for authorship, are named in the Acknowledgments and have g.
Corresponding Author: Pankajakshan, V.; Department of Electronics & Communication Engineering, India; email:
Appears in Collections:Journal Publications [ECE]

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