Exploring DCT coefficient quantization effect for image tampering localization

@article{Wang2011ExploringDC,
  title={Exploring DCT coefficient quantization effect for image tampering localization},
  author={Wei Wang and Jing Dong and Tieniu Tan},
  journal={2011 IEEE International Workshop on Information Forensics and Security},
  year={2011},
  pages={1-6}
}
In this paper, we focus on image tampering detection and tampered region localization. We find that the probability distributions of the DCT coefficients of a JEPG image will be influenced by tampering operation. Hence, we model the distributions of AC DCT coefficients of JPEG image and detect the tampered region from the unchanged region by using their different distributions. Based on an assumption of Laplacian distribution of unquantized AC DCT coefficients, Laplacian Mixture Model (LMM) is… CONTINUE READING
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