A Countermeasure against Double Compression Based Image Forensic

Shen WANG  Xiamu NIU  

IEICE TRANSACTIONS on Information and Systems   Vol.E95-D   No.10   pp.2577-2580
Publication Date: 2012/10/01
Online ISSN: 1745-1361
DOI: 10.1587/transinf.E95.D.2577
Print ISSN: 0916-8532
Type of Manuscript: LETTER
Category: Image Processing and Video Processing
image forensic,  evaluation model,  double compression,  genetic algorithm,  

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Compressing a JPEG image twice will greatly decrease the values of some of its DCT coefficients. This effect can be easily detected by statistics methods. To defend this forensic method, we establish a model to evaluate the security and image quality influenced by the re-compression. Base on the model, an optimized adjustment of the DCT coefficients is achieved by Genetic Algorithm. Results show that the traces of double compression are removed while preserving image quality.