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中文摘要：
以图像信息安全问题为背景，针对彩色图像的存储特性，给出了一种空域彩色图像的二级置乱算法。其利用改进的Gray编码技术对彩色图像的三基色进行置乱，借助彩色图像的自身信息构造置乱索引矩阵，对彩色图像的位置信息进行遍历变换。此方法即安全又方便。实验结果表明，与其它方法相比，该算法有良好的置乱度，且易于实现，同时提高了加密效率。
英文摘要：
With the security problem of image information as research background, a new scrambling method is proposed based on the storage characteristic of color images. The improved Gray code is used to realize the tricolor scrambling transformation in spatial domain. Then the scrambling index matrix is built by the information embedded in image, which separately scrambles the position of color image under ergodic transformation. This method is safe as well as simple. Experimental results show that the proposed algorithm has better scrambling effect in comparison with other approaches, it＇ s easy to realize, and the algorithm has higher encryption efficiency.
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