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Enhanced images watermarking based on amplitude modulation

Enhanced images watermarking based on amplitude modulation. Image and Vision Computing, 24 (2006), 111 – 119 Authors :T. Amornraksa, K. Janthawongwilai Presenter: 李振祥. Outline. Introduction Amplitude modulation based watermarking The proposed method Experimental results Conclusions.

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Enhanced images watermarking based on amplitude modulation

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  1. Enhanced images watermarking based on amplitude modulation Image and Vision Computing, 24 (2006), 111–119 Authors :T. Amornraksa, K. Janthawongwilai Presenter:李振祥

  2. Outline • Introduction • Amplitude modulation based watermarking • The proposed method • Experimental results • Conclusions

  3. Introduction • L(I,j)=0.299R(I,j)+0.587G(I,j)+0.114B(I,j) • By balancing watermark bits around the embedding pixel.(preparing process) • By properly tuning the strength of embedding watermark. (embedding process) • By modifying the methods of pixel prediction. (retrivieval process)

  4. Amplitude modulation based watermarking(1/3) Scaling factor Luminance Watermark

  5. Amplitude modulation based watermarking(2/3)

  6. Amplitude modulation based watermarking(3/3) rewrite

  7. The proposed method

  8. The proposed method-1 • XOR (for watermark)

  9. The proposed method-1 0

  10. The proposed method-2 • Gaussian mask

  11. 6 7 5 7 7 7 6 6 7 7 8 8 7 7 8 8 9 9 The proposed method-3 • Pixel value replacing

  12. Experimental results

  13. Experimental results

  14. Experimental results

  15. Experimental results

  16. Experimental results

  17. Experimental results

  18. Experimental results

  19. Experimental results

  20. Experimental results

  21. Experimental results

  22. Experimental results

  23. Experimental results (Attack)

  24. Experimental results (Attack)

  25. Experimental results (Attack)

  26. Experimental results (Attack)

  27. Experimental results (Attack)

  28. Experimental results (Attack)

  29. Conclusions To improve accuracy and robustness of the watermark can use: • Employing an error control coding • Multiple embedding techniques

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