基于直方图对二值图像无损数据隐藏算法的改进

提出一种改进基于游程编码和直方图对二值无损数据隐藏算法的新方法.先对载体二值图像进行"与"操作或"异或"操作的预处理,再利用基于游程编码的直方图对的二值图像无损数据隐藏方法进行数据嵌入.实验表明,该方法在嵌入容量和视觉效果都优于改进前的方法.     

基于整数小波的无损数据隐藏

介绍两种基于整数小波的无损数据隐藏方法,分别称为扩谱方法及压缩扩展方法.这两种方法均把数据嵌入到图像整数小波变换后的高频子带系数中;为防止小波反变换时图像灰度溢出问题,直方图调整技术被使用.实验结果表明,两种方法均达到甚至超过当前无损数据隐藏领域最好水平.     

A secure image protection algorithm by steganography and encryption using the 2D-TSCC

Based on the two-dimensional (2D) tan-sin-cos-coupling (2D-TSCC), a new image protection method is designed, this method includes steganography and encryption. First, a 2D-TSCC system is designed. The 2D-TSCC has a large parameter space in a hyperchaotic state. The chaotic trajectory fills the entire window. The chaotic sequence generated by the 2D-TSCC has a good pseudorandomness, so it can be used in steganography and encryption. Then, the amount of information contained in each bit of the cover image is analyzed, and the three bits which carry the least amount of information are selected. The secret image is hidden in these three bits base on the 2D-TSCC. Finally, the carrier image is scrambled and diffused by the 2D-TSCC. The ciphertext is generated in this way. Send the ciphertext to the recipient through channel transmission, and the recipient obtains the secret image by decrypting twice.     

基于整数小波的无损数据隐藏

介绍两种基于整数小波的无损数据隐藏方法，分别称为扩谱方法及压缩扩展方法。这两种方法均把数据嵌入到图像整数小波变换后的高频子带系数中；为防止小波反变换时图像灰度溢出问题，直方图调整技术被使用。实验结果表明，两种方法均达到甚至超过当前无损数据隐藏领域最好水平。