基于骑士巡游变换的数字图象细节隐藏技术

为了研究一种不致引起他人破解欲望只置乱图象细节。而不破坏图象总体形象的数字图象隐藏技术，首先给出了骑士巡游问题及骑士巡游矩阵的概念，并提出了一种新的图象置乱变换--骑士巡游变换，同时分析了该变换方法隐藏图象细节的原理；然后，给出了图象细节隐藏的实验结果，实验结果表明，该方法不仅达到了隐藏图象细节而不破坏图象总体形象的目的，而且使隐藏图象看上去像受到某种噪声干扰一样，从而不易引起别人破解的欲望，同时该变换还可以很好地将文字信息隐藏在图象之中；最后，对骑士巡游变换在图象伪装与隐藏方面的特性进行了分析，表明该变换具较高的保密度和较强的免疫性。

Digital Image Details Hiding Technology Based on Knight-tour Transformation

This paper is devoted to seek a new image hiding technology, which only scrambles the detail of images and keeps invariable in the mass, instead of arousing the desire to decrypt the image. Firstly, the concept of knight tour problem and knight tour matrix are introduced. A new scramble transformation is presented, which is called a knight tour transformation(KTT). The principle that KTT can hide the details of images is analyzed. Secondly, several experimental results involving details hiding of images are given. Several edges detection experiments are also given to illustrate the usefulness of our method in hiding images' details. The experiments show that the image is approximately invariable in collectivity and it seems to be polluted by some noises. Therefore, the scrambled image does not easily stimulate other people's desire of trying to decrypt it. In addition, the transformation also can hide text information into image. By means of this the security of image and the information hiding into it are increased. This is propitious to transmit security of image details and confidential texts. Finally, it shows that the security is high and the immunity is strong by analyzing KTT 's characteristics on image hiding and disguising.