彩色量子图像的水印方案-《计算机技术与发展》

文章信息/Info

Author(s):: LU Ai-ping; LI Pan-chi^*; School of Computer and Information Technology,Northeast Petroleum University, Daqing 163318,China

Keywords:: quantum information processing; quantum image processing; quantum image representing; quantum image watermarking

摘要:: 图像水印是信息安全领域的基本问题,在经典图像处理中已被深入研究。然而在将来的量子计算机上如何实现水印图像的嵌入和抽取, 目前还不够成熟。文中提出了两种量子彩色图像水印方案,其中水印图像为灰度图像, 封面图像为彩色图像,水印图像的大小为载体图像的八分之一。首先,将水印图像扩大八倍,并使其每个像素的三基色颜色值仅为 1 个二进制位。然后,采用 NEQR 模型将载体图像和扩大后的水印图像都转换为量子图像,最后使用 Toffoli 门将水印像素的单比特颜色值,嵌入到载体图像的最小显著位中,完成水印嵌入过程。抽取过程为嵌入的逆过程。设计了可并行实现嵌入和抽取过程的量子线路,在经典计算机上,采用 MATLAB 矩阵模拟量子计算中的酉算子,仿真结果验证了该方法的安全性。

Abstract:: Image watermarking is a basic problem in the field of information security,which has been deeply studied in classical image processing. However, how to implement the embedding and extraction of watermarking image on future quantum computers is still not mature enough. We propose two quantum color image watermarking schemes,in which the watermark image is a gray-scale image and the cover image is a color image. The size? of the watermark image is one eighth of the carrier image. Firstly,the watermark image is expanded by eight times so that the three primary color values of each pixel are only one binary bit. Next,the NEQR (novel enhanced quantum representation) model is used to transform the carrier image and the enlarged watermarking image into quantum image. Finally, the Toffoli gate is used to embed the single-bit color value of the watermark pixel into the least significant bit of the carrier image to complete the watermark embedding process. The extraction process is the inverse process of embedding. We design the quantum circuits to realize the embedding and extracting process in parallel. On the classical computer,the unitary operator in quantum computation is simulated by MATLAB matrix. The simulation results verify the security of the proposed method.