Abstract: Propose one kind of digital steganography algorithm based on Human Visual System（HVS） and Discrete Wavelet Transform（DWT）.Combine with the different characteristics from human eyes，the authors divide the secret information and embed them into the middle and high frequency subbands which in each R，G，B layer.The sequence according to the significance of subbands based on DWT from low to high.The results suggest the good invisibility can be achieved，and the hiding capacity of information is large.The new steganography algorithm based on the color image，solves the communication security problem of the information at Internet well.

Key words: steganography, Human Visual System（HVS）, Discrete Wavelet Transform（DWT）

摘要： 提出一种基于人眼视觉系统（HVS）和离散小波变换（DWT）的数字密写算法，结合人眼对遮掩特性的差异，将秘密信息分段嵌入到R、G、B三层的小波中高频系数中，嵌入的顺序按照频带的重要性由低到高嵌入，实验证明，该算法有较好的隐蔽性和较高的嵌入量，通过对彩色图片的数字密写来进行文本信息传输，较好地解决了在互联网上信息传输的通信安全问题。

关键词: 数字密写, 人眼视觉系统, 离散小波变换