摘要： 根据图像间的相关性，提出一种新的隐写方法。将秘密图像和载体图像进行小波分解，并将秘密图像的小波域分块，对每一块采用多尺度块匹配机制在载体图像的小波域中寻找与其相似的块。根据相似块计算秘密图像小波域的替换图。用零树小波编码方法对替换图编码。将编码信息以及相似块的映射规则等嵌入载体图像的最低有效位。实验结果表明该方法优于相关文献方法。当以典型的F-16飞机图为秘密图像时，用该方法所提取的秘密图像质量至少提高3dB。

关键词: 图像, 多尺度块匹配, 隐写术

Abstract: This paper proposes a novel image steganography based on relativity between images. The secret image and cover image are decomposed by wavelet transform, and the wavelet domain of the secret image is divided into blocks. For each block, multiresolution block watching scheme is utilized to search for its similarity block in the wavelet domain of the cover image. Then, the replacement image of the secret image is calculated according to the similarity block, and it is coded by zero tree wavelet coding method. The coded bit information and map rules of the similarity block are embedded into the least significant bits of the cover image. The experimental results demonstrate the proposed method is superior to relative methods in the literature. Especially, the quality of the extracted secret image is improved by 3 dB at least when the secret image is typical image of the F-16 plane.

Key words: image, multiresolution block matching, steganography

中图分类号: 

• TP18