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基于联合功率谱分区复用的光学多图像加密方法与实验

Experimental Research and Encryption Method of Optical Multi-Images Based on Joint Power Spectral Partition Multiplexing

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摘要

针对光学多图像加密出现的串扰噪声大和复用容量小的问题,提出了一种基于联合功率谱(JPS)分区复用的光学多图像加密方法。该方法首先利用相位恢复算法开展相位模板优化设计,压缩了单通道JPS面积,然后在优化后的相位模板上叠加线性相位,使各通道JPS在频谱面上产生不同的位置平移,再经过窗口滤波,实现无串扰叠加。此外,以“密钥相位核+偏转角数据包”形式进行密钥内容规划,在确保加密方法安全性以及密钥空间足够大的同时,压缩了需传递的密钥数据量。数值仿真结果表明,对9幅灰度图像进行加密,其解密图像与原始图像的相关系数值均达到0.94以上,解密效果显著。当解密质量评判阈值设定在0.95时,灰度图像和二值图像的最大压缩效率因子分别达到12和32,密文压缩能力显著。最后,搭建光学实验系统,进一步验证了该方法的可行性。

Abstract

Aiming at the problems of large cross-talk noise and small multiplexing capacity in the optical multi-image encryption system, an optical multi-image encryption method based on joint power spectral (JPS) partition multiplexing is proposed. First, the phase retrieval algorithm is utilized for the optimal design of phase masks and the single-channel JPS area is thus compressed. Then, the corresponding linear phases are superimposed on the optimized phase masks and so that the each-channel JPS is shifted differently in its spectral plane. After the window filtering operation, the superposition without crosstalk is realized. In addition, the key content planning is carried out in the form of “key phase kernel plus deflection angle packet”. While the security of encryption method and the large enough key space are ensured, the key data needed to be transferred is compressed. The numerical simulation results show that, when nine gray-scale images are encrypted, the correlation coefficients between the decrypted images and the original images are over 0.94 and the decryption effect is obvious. When the evaluation threshold of decryption quality is set as 0.95, the maximum compression efficiency factors of gray-scale and binary images reach 12 and 32, respectively. The cipher-text compression ability is remarkable. Finally, an optical experiment system is built and the feasibility of this method is further verified.

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中图分类号:O438.1;TN911.74

DOI:10.3788/cjl201845.1209003

所属栏目:全息与信息处理

基金项目:河北省自然科学基金(F2016506014)

收稿日期:2018-07-04

修改稿日期:2018-08-13

网络出版日期:2018-08-24

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刘杰:陆军工程大学石家庄校区电子与光学工程系, 河北 石家庄 050000北京理工大学光电学院光电成像技术与系统教育部重点实验室, 北京 100081
白廷柱:北京理工大学光电学院光电成像技术与系统教育部重点实验室, 北京 100081
沈学举:陆军工程大学石家庄校区电子与光学工程系, 河北 石家庄 050000
窦帅风:陆军工程大学石家庄校区电子与光学工程系, 河北 石家庄 050000
林超:海军航空大学, 山东 烟台 264001
陈琪:陆军工程大学石家庄校区电子与光学工程系, 河北 石家庄 050000
武东生:陆军工程大学石家庄校区电子与光学工程系, 河北 石家庄 050000

联系人作者:刘杰(yclj07@163.com)

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引用该论文

Liu Jie,Bai Tingzhu,Shen Xueju,Dou Shuaifeng,Lin Chao,Chen Qi,Wu Dongsheng. Experimental Research and Encryption Method of Optical Multi-Images Based on Joint Power Spectral Partition Multiplexing[J]. Chinese Journal of Lasers, 2018, 45(12): 1209003

刘杰,白廷柱,沈学举,窦帅风,林超,陈琪,武东生. 基于联合功率谱分区复用的光学多图像加密方法与实验[J]. 中国激光, 2018, 45(12): 1209003

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