基于灰度分割和双随机相位编码的隐藏技术

Information Hiding Scheme Based on Gray-Level Segmentation and Double-Random Phase-Encoding Techniques

提出了一种灰度图像的隐藏方法，将待隐藏图像按照直方图统计结果以及彩色宿主图像的特征分割成3幅灰度图像，再经双随机相位编码和加权运算后，将分割出来的3幅灰度图像隐藏于一幅彩色图像的红绿蓝（RGB）的3个分量中。由于双随机相位编码技术具有很高的安全性，而且加权系数也可以作为加密的密钥得以应用，因此增强了单纯双随机相位的安全性能。实验结果表明，该方法具有良好的抗剪切和抗噪声能力，并且重建的图像与原灰度图之间的相关系数达到99％以上。

A new method for hiding a gray image is presented. Based on the histogram of hidden image and the characteristic of color host image, the gray image is divided into three gray sub-images. Mter being further encoded with double-random phase-encoding technique and multiplied by three weighted coefficients, three sub-images are hided into the red, green, blue （RGB） components of a color image, respectively. Besides the double random phases, three weighted coefficients can also be used as encrypfion keys in this method, so the security capability is enhanced. The experimental results show that this method possesses a good shear resistance and anti-noise ability. It is also testified that correlaltion coefficient is more than 99 % between the reconstructed image and the original gray image.