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A novel robust image forensics algorithm based on L1-norm estimation (IWDW 2016)

02/08/2018 - Multimedia Forensics

X. He, Q. X. Guan, Y. F. Tong, X. F. Zhao, H. B. Yu                                          

Abstract

To improve the robustness of the typical image forensics with the noise variance, we propose a novel image forensics approach that based on L1-norm estimation. First, we estimate the kurtosis and the noise variance of the high-pass image. Then, we build a minimum error objective function based on L1-norm estimation to compute the kurtosis and the noise variance of overlapping blocks of the image by an iterative solution. Finally, the spliced regions are exposed through K-means cluster analysis. Since the noise variance of adjacent blocks are similar, our approach can accelerate the iterative process by setting the noise variance of the previous block as the initial value of the current block. According to analytics and experiments, our approach can e ectively solve the inaccurate locating problem caused by outliers. It also performances better than reference algorithm in locating spliced regions, especially for those with realistic appearances, and improves the robustness e ectively.

Cite the paper as:

[1] X. He, Q. X. Guan, Y. F. Tong, X. F. Zhao, H. B. Yu, A novel robust image forensics algorithm based on L1-norm estimation, In Revised Selected Paper of 15th International Workshop on Digital-forensics and Watermarking (IWDW 2016), Beijing, China, Sep.17-19, 2016, LNCS 10082, pp. 145-158, Springer, 2017.  

Forensics L1-norm Paper