彩色图像信息密写新方法

为实现彩色图像中的安全隐写，首先通过混沌映射算法将图像去相关处理，再经过离散正弦变换, 提出以彩色图像为载体的安全隐写方法，应用二值图像信息嵌入技术，将隐蔽信息隐藏在颜色分量的较高层位面中，可实现优良的隐蔽性和较大的嵌入量。所使用的二值图像数据隐藏方案包括一组完备的规则，能够准确判断边缘像素是否可承载嵌入数据，保证嵌入数据的无差错盲提取，并可引入密钥以增强安全性。实验表明，在彩色图像中数据嵌入量达到每像素1.5 b时视觉不可察觉，峰值信噪比保持在40 dB以上，直方图无异常，并能抵御多种有效的隐写分析算法，兼顾了隐蔽信息容量和安全性。同时，解决了含密图像进行压缩或作任何有损的格式变换、数据嵌入、信息提取、抵御隐写分析算法难题。

New method for secure steganography in color images

A new method for hiding secret information in color images was proposed, in which bit planes were treated as binary images. A set of rules was used to check boundary pixels in the bit planes for data embedding eligibility. These rules can ensure correct extraction of the secret data from the stego-image without any other additional information. A key was introduced in identifying the eligible embedding positions to enhance security. Experiments show that, at an embedding rate of 1.5 bits per color pixel, the stego-images have no perceptual and histogram abnormality with PSNR values greater than 40 dB, and can resist several effective methods for steganalytical detection, achieving a good trade-off between security and embedding capacity. It also can solve the difficult problem that format change, data embedding, information extraction of the image containing secret may happen when being processed or compressed, and can resist several effective methods for steganalytical detection.