利用QR码在光学干涉多图像加密系统中实现信息高质量恢复  

Using QR Codes in Multi-Image Optical Interference Encryption System to Reconstruct High Quality Original Information

作　　者：王红娟[1] 王志鹏[1] 张颖颖[1] 刘旭焱[1] 秦怡[1] 

机构地区：[1]南阳师范学院物理与电子工程学院,河南南阳473061

出　　处：《光学学报》2014年第9期78-84,共7页Acta Optica Sinica

基　　金：国家自然科学基金(61306007);河南省基础与前沿技术研究计划(142300410184);南阳师范学院高层次人才科研启动基金(nytc2006k100);南阳师范学院青年基金(QN2014016)

摘　　要：为了解决解密图像之间的串扰噪声,在基于干涉原理的多图像加密系统中引入了快速响应矩阵(QR)码。该光学加密系统加密过程使用计算机进行数字运算实现,而解密过程可以使用数字实现,也可以使用光学方法实现。加密时多组原始信息首先被转换为相应的QR码,然后多组QR码被解析地隐藏于两个纯相位板中。解密时,使用相干光照射两个纯相位板,并通过分束镜使二者的衍射光场进行叠加,再经不同的衍射距离后所得的衍射强度即为解密图像,把得到的几组解密图像直接用智能手机进行扫描,即可完全恢复原始信息。相较于原来的基于干涉原理的多图像加密方法,该加密方法成功地解决了串扰噪声问题,实现了信息的高质量恢复。计算机模拟结果证实了该方法的有效性,也分析了对裁剪和噪音攻击的稳健性。In order to solve the crosstalk problem between decrypted images, quick response （QR） code is introduced in the image encryption system based on principle of interference. The encryption process is realized on computer digitally and the decryption process can be completed optically or digitally. For encryption, multiple sets of the information to be encrypted is first transformed into the corresponding QR code, then these QR codes are analytically hidden into two phase only masks （POMs）. For decryption, the diffraction field of the two POMs is superposed by utilizing the beam splitters. After that the wavefront propagates to different distances and the intensity of the complex field, which are exactly the decrypted images. Directly scanning by a smartphone, original information can be completely retrieved. The encryption method successfully solves the problem of crosstalk noise. Simulation results are presented to verify the validity of the proposed approach. The feasibility and robustness against occlusion and noise attacks are verified by a series of numerical simulations.

关 键 词：信号处理 光学加密 干涉原理 QR码 多图像加密 

分 类 号：TP751[自动化与计算机技术—检测技术与自动化装置]