Abstract: A double-random phase-encoding technique based information-hiding scheme was improved for high capacity information hiding. The hidden image was encoded with double-random phase-encoding technique and embedded into the enlarged host image to obtain the composed image. The superposition method to embed the encoded image was different from the original method, which could increase the information hiding capacity. In addition, compared with the original method, the quality of the composed image was improved, while the quality of the recovered hidden image was maintained. Also, the security of the method was enhanced markedly. Theoretical analysis and experimental results demonstrate the effectiveness of the improved scheme.

Key words: information hiding

摘要： 针对一种基于双随机相位编码的图像隐藏算法进行了改进，实现了更高容量的信息隐藏。该算法对于待隐藏图像进行双随机相位编码之后，将编码图像嵌入到以一定方式扩展的宿主图像中得到混合图像。在嵌入编码图像时采用了不同于原方法的叠加方式，从而提高了信息隐藏量。此外，与原方法相比，在保持恢复的隐藏图像质量的同时，改善了混合图像的质量，且明显增强了算法安全性。理论分析及实验均证明了方法的有效性。

关键词: 双随机相位编码, 信息隐藏, 容量, 安全性, double-random phase-encoding, capacity, security