彩色图像的量子水印算法  

Quantum Watermarking Algorithm for Color Images

作　　者：尚福华[1] 李盼池[1] 

机构地区：[1]东北石油大学计算机与信息技术学院,黑龙江大庆163318

出　　处：《信号处理》2017年第11期1424-1435,共12页Journal of Signal Processing

基　　金：国家自然科学基金(61170132);黑龙江省自然科学基金(F2015021)

摘　　要：为提高彩色图像的量子水印效果,本文提出一种基于新颖的增强量子描述(NEQR)的彩色图像水印嵌入及提取方法。首先将水印图像的幅度调整为与载体图像同样大小,然后采用NEQR方案将载体图像量子化,将水印图像嵌入到载体图像中。两幅图像独立存在,采用一个辅助比特进行切换。通过对水印图像中像素灰度值的24个量子比特实施相位旋转实现对水印图像的置乱。嵌入的水印图像被置乱后,每个像素的灰度信息为一个均衡的量子叠加态,测量后整幅图像为一个均匀的白噪声。水印图像的提取过程为嵌入的逆过程,只需采用嵌入过程所用算子的共轭转置即可。该方法的优点是,水印的嵌入不影响载体图像的视觉效果,且嵌入的水印图像具有很好的安全性。In order to improve the effect of quantum watermarking for color image, In this paper, a new method of embed- ding and extracting the color watermark image based on the novel enhanced quantum description （ NEQR ） is proposed. Firstly, the magnitude of the watermark image is adjusted to the same size as the carrier image, then, the carrier image is described as the quantum superposition state by the NEQR scheme and the watermark image is embedded into the carrier image. Two images exist independently, using an auxiliary qubit to switch between each other. Through the implementation of the phase rotation of 24 qubits of describing pixel gray value of the watermark image, the watermark image is scrambled. In the scrambled watermark image, the gray level information of each pixel is a balanced quantum superposition state in which whole watermark image is a uniform white noise after it is measured. Watermark image extraction is the inverse process of embedding process, which can be achieve by using the corresponding conjugate transpose operators of that used in embedding process. The advantage of this method is that the watermark embedding does not affect the visual effect of the carrier image, and the embedded watermark image has a very good security.

关 键 词：图像处理 量子图像描述 量子图像置乱 量子图像水印 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]