Abstract
In this paper, a new approach is proposed for the detection of JPEG anti-forensic operations. It is based on the fact that when a JPEG anti-forensic operation is applied, the values of DCT coefficients are changed. This change decreases, especially in high frequency subbands, if we apply anti-forensic operation again. Hence, we propose to calculate a normalized difference between absolute values of DCT coefficients in 28 high frequency AC-subbands of the test image and its anti-forensically modified version. Based on this normalized feature, it is possible to differentiate between uncompressed and anti-forensically modified images. Experimental results show the effectiveness of the proposed method.
Cite
CITATION STYLE
Bhardwaj, D., Kumawat, C., & Pankajakshan, V. (2018). A method for detecting JPEG anti-forensics. In Communications in Computer and Information Science (Vol. 841, pp. 190–197). Springer Verlag. https://doi.org/10.1007/978-981-13-0020-2_17
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