一种基于密钥的受控最低有效位修改技术的稳健型量子水印算法

如何更好地保护量子图像的版权,是量子水印技术的一个重要研究课题。基于对数极坐标的量子图像表示,提出了一种新颖的量子水印算法。根据通信双方共享一组密钥的值,发送方选择量子载体图像像素灰度值的高四位中的某一位作为受控位;再根据所选受控位的值,发送方将水印信息嵌入到量子载体图像的最低有效位或次最低有效位上。这种基于密钥的受控最低有效位修改技术,提高了量子水印图像的透明性和稳健性。基于MATLAB的实验仿真和性能分析,也表明新算法在透明性、稳健性和嵌入容量上有着良好的表现。

Robust quantum watermarking algorithm based on key to implement controlled least significant qubit modification technique

How to better protect the copyright of quantum images is an important research subject in quantum watermarking technology. Based on the representation of quantum log-polar images, this paper proposed a novel quantum watermarking algorithm. According to the value of the key shared by the both communicating parties, the sender selected one of the high four qubits of the pixel gray value of quantum carrier image as the controlled qubit. And the watermarking information was embedded into the least significant qubit or the peripheral least significant qubit of quantum carrier image on the basis of the value of the selected controlled qubit. Utilizing the key to implement the controlled least significant qubit modification technique improved the transparency and robustness of quantum watermark image. Experimental simulation and performance analysis based on MATLAB showed that the new algorithm has a good performance on transparency, robustness and the embedding capacity.