整数小波域湿纸码自适应信息隐藏算法

Wet Paper Code Based Adaptive Steganography in IWT Domain

通过对一些已有的自适应隐写算法进行分析,提出一种旨在提高安全性的整数小波域自适应信息隐藏算法.根据隐藏的数据量和载体单元特性确定阈值,自适应地在图像整数小波高频子带系数中选择合适的隐藏位置;利用湿纸码双层嵌入法嵌入秘密数据,并采用直方图调整策略保持小波高频子带系数直方图特性,由此从多方面提高了信息隐藏算法的安全性.大量与同类算法的对比实验表明,在嵌入率小于100%的条件下,该算法具有较强的视觉隐蔽性和抗统计检测的能力.

By analyzing the security of some nowadays adaptive steganographies,a new wet paper code（WPC） based adaptive steganography in IWT domain is proposed in order to enhance the security.The scheme calculates the threshold according to the quantity of the secrete message and the cover element＇s characteristic,then adaptively chooses the complex texture region as embedding position,embedding secrete data by two layer WPC steganography,and adopt a new histogram adjustment strategy to prevent distortion.By such way,the capability of resisting steganalysis is improved.Quantities of experiments show that under average embedding rate of 100%,the new algorithm behaves better in visual and statistical imperceptibility.