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

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Presentation transcript:

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

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

original image Embedding Algorithm stego-image Secret Data Extraction Algorithm

peak pixels Peak=3 Zero=7 Original image Zero

Secret data= pixels stego-image

Original image error value=basic pixel-residual pixel rrr rbr rrr

residual value peak zero peak=-1,zero=-4 peak=0,zero=

Secret data={ }

residual pixel=basic pixel-error value stego image rrr rbr rrr

Secret data={ }

*3 4*4

Ni et al’s scheme peak=16591 可藏個 bit This scheme peak=23723 peak=13539 可藏個 bit

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

 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.