A Method for Detecting JPEG Anti-forensics
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.
- 5.Stamm, M.C., Tjoa, S.K., Lin, W.S., Liu, K.J.R.: Anti-forensics of JPEG compression. In: Proceedings of IEEE International Conference on Acoustics, Speech and Signal Processing, pp. 1694–1697, March 2010Google Scholar
- 10.Li, H., Luo, W., Qiu, X., Huang, J.: Identification of various image operations using residual-based features. IEEE Trans. Circ. Syst. Video Technol. PP(99), 1 (2016)Google Scholar
- 12.Schaefer, G., Stich, M.: UCID - an uncompressed colour image database. In: Proceedings of SPIE, pp. 472–480, March 2004Google Scholar
- 13.Gloe, T., Bhme, R.: The ‘Dresden Image Database’ for benchmarking digital image forensics. In: Proceedings of the 25th Symposium on Applied Computing (ACM SAC 2010), vol. 2, pp. 1585–1591 (2010)Google Scholar