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Reversible image hiding scheme using predictive coding and histogram shifting

Reversible image hiding scheme using predictive coding and histogram shifting. Source: Signal Processing , vol. 89, no. 6, June 2009, pp. 1129-1143. Author: Piyu Tsai, Yu-Chen Hu, and Hsui-Lien Yeh Speaker: Chia-Chun Wu Date: 2009/10/30. Outline.

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Reversible image hiding scheme using predictive coding and histogram shifting

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  1. Reversible image hiding scheme using predictive coding and histogram shifting Source: Signal Processing, vol. 89, no. 6, June 2009, pp. 1129-1143.Author: Piyu Tsai, Yu-Chen Hu, and Hsui-Lien Yeh Speaker: Chia-Chun Wu Date: 2009/10/30

  2. Outline • Introduce histogram-based reversible data hiding scheme • The proposed method and how to increase hiding capacity • Experiment • Conclusion

  3. Introduction • Histogram-based reversible data hiding Stego image Original image Peak value=6 Zero value=4, we noted: (6,4) Secret=101100 Only peak value can hide data, If secret value=0,shift peak value closer to zero. Histogram of original image

  4. The proposed method (1/4) Step1: Linear prediction Residual Image Original Image Basic pixel histogram of residual image

  5. The proposed method (2/4) Step2: find peak and zero value, shift residual value Peak value=1 Zero value=3 Peak value=-3 Zero value=-1 Residual image Shifted residual value

  6. The proposed method (3/4) Secret bit: 101100 10101, (1,3) (-3,-1) If secret bit=0, shift peak value Hiding area Residual image After hiding secret Stego image

  7. The proposed method (4/4) Overlapping scheme for increasing hiding capacity pick two pair: (0,3) (1,4) • If secret bit=1, peak value 0 is unchanged • If secret bit=0, peak value 0 is modified to 1 • 2. If secret bit=1, peak value 1 is modified to 2 • If secret bit=0, peak value 1 is modified to 3 • 3. Residual value 2 is modified to 4

  8. Experiments (1/2) Original image and histogram Stego image and histogram

  9. Experiments (2/2)

  10. Conclusions • The proposed method can provide higher hiding capacity then histogram-based data hiding scheme. Besides, the quality is good.

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