中文摘要：

定义图像中像素的嵌入失真是图像自适应隐写中的关键。为提高图像自适应隐写的安全性,根据最小化嵌入失真原则,提出了一种基于小波系数相关性的图像自适应空域隐写术。首先以一维高通、低通滤波器为工具构造方向滤波器;然后沿水平、垂直、对角线方向对图像进行方向滤波,并根据小波系数与其邻域系数的相关性对失真函数进行设计;最后根据像素的嵌入失真值,利用网格码（STC）对秘密信息进行嵌入。实验结果表明,该隐写术能够将嵌入区域集中在内容复杂的纹理区域,且能够有效抵抗通用隐写检测算法的分析。

英文摘要：

Defining the pixel ′ s embedding distortion is a key of image adaptive steganography.In order to improve the security of image adaptive steganography,this paper proposes an adaptive spatial steganography in spatial domain based on the correlation of wavelet coefficients for digital images according to the principle of minimizing a suitable defined distortion.Firstly,one-dimensional high-pass and low-pass filters are used to construct directional filters.Secondly,images are dealed with direction filtering through the direction of horizontal,vertical and diagonal,and the distortion cost function is designed according to the correlation of wavelet coefficients.Finally,the secret message is embedded by Syndrome Trellis Code（ STC） according to the pixel ′ s embedding distortion.The experiment results illustrate that the proposed method can not only make the embedding region focus on the texture regions whose content is complex,but also can resist the common steganalysis detection effectively.