Signed digit data hiding scheme

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• 作者：Wen-Chung Kuo^a ; ^{simonkuo@yuntech.edu.tw" class="auth_mail" title="E-mail the corresponding author} ; Chun-Cheng Wang^b ; Hong-Ching Hou^c
• 关键词：Steganography ; Data hiding ; LSB replacement ; EMD (Exploiting Modification Direction) ; MSD (Modified Signed-Digit)
• 刊名：Information Processing Letters
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：116
• 期：2
• 页码：183-191
• 全文大小：1445 K

文摘

The EMD (Exploiting Modification Direction) method by Zhang and Wang uses (2n+1$2n+1$)-ary notation to achieve secret message embedding into a cover image. However, the maximum capacity of this method is 1.16 bpp$1.16\text{bpp}$ for cover pixel number n=2$n=2$. Its embedding capacity rapidly decreases when selected pixels increase. In order to improve this shortcoming, a new data hiding scheme based on MSD (Modified Signed-Digit) is proposed. There are three major contributions in this proposed scheme. The first is only $\lceil \frac{n}{2}\rceil$ pixels will be modified and the value is +1 or −1 when the group has n   pixels. Secondly, the embedded capacity maintains at least 1 bpp$1\text{bpp}$ when n   is increasing. The last is the stego image quality is better than 52 dB$52\text{dB}$ when the cover image's pixels are greater than 4 for each group.