基于双快速反应码双随机相位加密系统的多重水印方法  

Multiple Watermarking Method Based on Double Random Phase Encryption System with Double Quick Response Code

作　　者：吴为民[1] 陈家祯 

机构地区：[1]福建船政交通职业学院信息工程系,福建福州350007 [2]福建师范大学数学与信息学院,福建福州350007

出　　处：《激光与光电子学进展》2017年第12期126-135,共10页Laser & Optoelectronics Progress

基　　金：福建省教育厅中青年科研项目(JAT160715);福建省交通厅科研项目(201328)

摘　　要：提出了一种快速反应(QR)码结合双随机相位加密系统及频分复用的多重水印方法。为了扩大水印容量,首先将QR码的有效编码区域组合为新图像,再将两幅组合后的图像分别作为实部与虚部,构成双QR码复信号。在空间域和空间频率域用随机相位模板将复信号编码为复噪声形式的加密水印信号。对各组双QR码加密水印信号进行预处理及频分复用,以产生多重水印。水印信号以冗余方式嵌入宿主图像经拉普拉斯分解后残差分量的中高频区域,水印信号的恢复无需原始宿主图像,可实现盲提取。仿真结果表明,所提方法在缩放、滤波和旋转等方面表现出较好的稳健性,对JPEG压缩、剪切、高斯噪声等也具有一定的稳健性。分析了复用容量及作为密钥的随机相位模板对重建水印质量的影响。A multiple watermarking method combining a double random phase encryption system, frequency division multiplexing technology and quick response （QR） code is proposed. In order to enlarge the watermark capacity, an effective coding region of QR code is combined into a new image, and then the two composite images are used as real and imaginary parts respectively to form double QR code complex signals. The complex signal is encoded with random phase masks in the space domain and the spatial frequency domain into an encrypted watermark signal in form of complex noise. The double QR code encryption watermark signals are preprocessed and frequency division multiplexing is used to generate multiple watermark. The watermark signal is embedded redundantly in the medium-high frequency region of the residual components of the host image after Laplace decomposition. The watermark signals can be recovered without original host image, and the blind extraction can be achieved. Simulation results show that the proposed method is robust in scaling, filtering and rotation, and has a certain robustness for JPEG compression, cropping and Gaussian noise. The muhiplexing capacity and the influence of random phase mask as a key on the quality of reconstructed watermark are also analyzed.

关 键 词：全息 快速反应码 双随机相位加密 多重水印 拉普拉斯分解 

分 类 号：O438[机械工程—光学工程] TP309[理学—光学]