1. Piyu Tsia,Yu-Chen Hu,Hsiu-Lien Yen Signal Processing 日期 :1 月 4 號 報告者 : 許睿中

2.  Introduction  Related works  The proposed scheme  Experimental results  Conclusions

3. original image Embedding Algorithm stego-image Secret Data Extraction Algorithm

4. peak 66222 55553 13333 13444 12424 pixels Peak=3 Zero=7 Original image 66222 55553 13333 13444 12424 Zero 77222 66663 13333 13555 12525

5. 77222 66663 13333 13555 12525 Secret data=101100 pixels 77222 66664 13443 13555 12525 stego-image

6. 154155 154151 154 155156154151 153154155156154151 153154155156154151 154 153151 155154153152151150 154155 154151 154 155156154151 153154155156154151 153154155156154151 154 153151 155154153152151150 Original image error value=basic pixel-residual pixel rrr rbr rrr 0 0154 10 -32 1532 123 10 01540 01 03 -21543 -203

7. 0 03 0154-21543 10-203 10-32 015401532 01123 residual value peak zero peak=-1,zero=-4 peak=0,zero=4 0 04 0154-31544 20-304 20-43 015401533 02224

8. 0 04 0154-31544 20-304 20-43 015401533 02224 Secret data={11000 00100 10100 110} 0 04 0154-31544 20-304 20-43 015401533 02224 1-2 04 0154-31544 21-304 21-4-23 01540-21533 -202224

9. 1 04 0154-31544 21-304 21-4-23 01540-21533 -202224 residual pixel=basic pixel-error value 153156155 154 155 152153155 157155150 155153150 151 149 152153155 154 156154152 155154150 157154150 157154150 stego image rrr rbr rrr

10. 153156155 154150 154 155157154150 152153155157154150 152153155157155156 154 155153150 156154152151 149 153156155 154150 154 155157154150 152153155157154150 152153155157155150 154 155153150 156154152151 149 1-2 04 0154-31544 21-304 21-4-23 01540-21533 -202224 Secret data={11000 00100 10100 110} 0 03 0154-21543 10-203 10-32 015401532 01123 154155 154151 154 155156154151 153154155156154151 153154155156154151 154 153151 155154153152151150

12. 0 05 -2 10-2 10-2 5666 5567 4567 4567 0 6 05 7 10 7 4567 5666 5567 4567 4567 3*3 4*4

14. Ni et al’s scheme peak=16591 可藏 16591 個 bit This scheme peak=23723 peak=13539 可藏 37262 個 bit

15. hide capacity=38771 PSNR=49.056db hide capacity=11416 PSNR=48.787db hide capacity=58281 PSNR=49.259db

16.  The proposed scheme intends to improve the histogram-based data hiding scheme which embeds secret data into the peak points of the image histogram.  To achieve a higher hiding capacity, secret data are embedded in the residual images instead of the image histogram.