1. Using quad smoothness to efficiently control capacity–distortion of reversible data hiding Chi-Nan Lin, Daniel J. Buehrer, Chin-Chen Chang, Tzu-Chuen Lu The Journal of Systems and Software 日期 :3.28 報告者 : 許睿中

2. Outline Related works The proposed scheme Experimental results Conclusion

3. Related works-Tian’s method Embedding h=5h’=11 206203 201 209 198

4. Related works-Tian’s method Extraction

5. Related works-Alattar’s method ab cd 2530 3540 a’b’ c’d’ 1728 3748 cover pixelsstego pixels Embedding

6. Related works-Alattar’s method a’b’ c’d’ 1728 3748 ab cd 2530 3540 Extraction recover pixels stego pixels

7. The proposed scheme

8. a1a2b1b2 a3a4b3b4 c1c2d1d2 c3c4d3d4 The proposed scheme

9. Experimental results

12. Embedding 100000 bits with Alattar’s versus the propose method.

13. Experimental results Stego-lena512.gif PSNR=31.8 payload=196299 Stego-baboon512.gif PSNR=21.2 payload=179918

14. Conclusion This proposed methods enhances Alattar’s work in term of effectively controlling the capacity versus distortion behavior.