一种基于小波变换的湿纸密写方法

Writing on Wet Paper Based on Wavelet Transform

基于对湿纸密写与小波域内密写方法的研究,提出了一种新的小波域内的湿纸密写方法.这种方法依据图像局部邻域内的纹理复杂程度在小波系数中进行选择性的嵌入,而秘密信息接收者无需知道具体的密写方法,只需做简单的矩阵乘法操作就可以提取秘密信息,从而实现了秘密信息传输过程中密写方法的不可见性.实验表明,本文的密写方法除具有很好的鲁棒性外,在隐蔽性上比传统小波域内的密写方法有了很大提升,是一种非常实用的密写方法.

Based on steganographic methods in wavelet domain and writing on wet paper, a new steganographic arithmetic in wavelet domain was proposed in this paper. The method selects images＇ wavelet coefficients based on the degree of texture complexity in the local neighborhood to embed secrete bits in them. The receivers can extract secret bits from carder images only by some matrix multiplications without knowing the formulas written by senders. Thus, the invisibility of arithmetic of this steganographic method is achieved in process of secrete information transmission. The experimental results of the proposed embedding method show a better robust performance against the methods of active attacks such as JPEG compression, noise addition and so on. And the security of the new method has been improved greatly compared with the classic wavelet steganographic methods because of its template of writing on wet paper.