基于光场调控和频移的多图像偏振加密方法  

Multipleimage Polarization Encryption Method Based on Light Field Regulation and Frequency Shifting

作　　者：张迪 于娜娜 席思星 郎利影 王晓雷[3] 张寰臻 Zhang Di;Yu Nana;Xi Sixing;Lang Liying;Wang Xiaolei;Zhang Huanzhen(School of Mathematics and Physics Science and Engineering,Hebei University of Engineering,Handan 056038,Hebei,China;Advanced Laser Technology Research Center,Hebei University of Technology,Tianjin 300401,China;Institute of Modern Optics,Nankai University,Tianjin 300350,China)

机构地区：[1]河北工程大学数理科学与工程学院,河北邯郸056038 [2]河北工业大学先进激光技术研究中心,天津300401 [3]南开大学现代光学研究所,天津300350

出　　处：《激光与光电子学进展》2023年第10期173-181,共9页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(11904073,61875093);河北省自然科学基金(F2019402351);河北省教育厅青年拔尖人才项目(BJ2020028);河北省科技计划(20371802D)。

摘　　要：提出一种基于全矢量光场调控和傅里叶变换频移的多图像非对称偏振光学加密新方法。首先,多幅待加密图像经过随机相位调制、傅里叶变换和频移相位调制后相干叠加构成一幅复振幅光学图像;然后将其干涉分解成两块纯相位掩模,并编码加载到基于4F系统的全矢量光场调控系统中;最后全光调控矢量光场经过偏振片后输出振幅型加密图像和密钥,它们被CCD接收,实现多幅图像的并行加密。解密时,在正确密钥条件下,根据调控光场的全矢量分布与加密图像的关系获取多幅解密图像。偏振片旋转的任意角度和干涉分解得到的纯相位图像作为密钥,极大地提高了光学图像加密系统的安全性。此外,多幅图像加密为单幅振幅型加密图像,便于保存和传输,加密系统的加密效率得到极大提高。仿真实验验证了所提多图像加密方案的有效性和可行性,实验结果表明所提方法具有很高的安全性、抗噪性、抗剪切能力和抗选择明文攻击性,具有一定的应用前景。This study proposes a new multiimage asymmetric polarization optical encryption method based on the fullvector light field control and Fourier transform frequency shifting.First,multiple images to be encrypted are coherently superimposed to form a complex amplitude optical image after the random phase modulation,Fourier transforms,and frequency shifting phase modulation.Next,the distribution of the image is the interference of two pure phase masks,and is encoded and loaded into the fullvector light field control system based on the 4F system.Finally,the alloptical control vector light field outputs amplitude type encrypted images and keys after passing through the polarizer,which are received by CCD to realize parallel encryption of multiple images.Multiple decrypted images can be obtained during decryption by solving the relationship between the control light field distribution(full vector distribution)and the encrypted image under the condition of the correct key.Any rotation angle of the polarizer and the phase only image obtained by interference decomposition are used as the key,which greatly improves the security of the optical image encryption system.The encryption of multiple images into a single amplitudetype encrypted image is convenient for storage and transmission,which improves encryption efficiency.A simulation study has verified the effectiveness and feasibility of the proposed multiimage encryption scheme,and the experimental results show that the proposed method has high security,noise resistance,shear resistance,and chosenplaintext attack resistance,which has specific application prospects.

关 键 词：光学图像加密 光场调控 频移 干涉分解 多图像加密 

分 类 号：O438[机械工程—光学工程]