应用二值图像信息隐藏技术实现彩色图像中的安全隐写

Steganography in Color Images Using a Binary Image Data Hiding Scheme

该文提出一种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 bits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.

A new method for hiding secret information in color images is proposed, in which bit planes are treated as binary images. A set of rules is 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 is 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.