光电图像加密系统研究-光学专业论文.docxVIP

华南师范大学硕士研究生学位论文 华南师范大学硕士研究生学位论文 摘要 密系统结构，因而加密图像的必威体育官网网址性能得到进一步的提高。 最后，为了从光学实验上验证本论文所提出的新方法，本文探讨 了光电图像加密实验系统的光路、主要光学器件的指标参数，并按本 文所提出的指标购置了相应的设备和器件，建立起了一个光电图像加 密实验系统，并通过三个相关的初步实验对所建立的系统进行了测试， 实验结果表明，所建成的实验系统能够完成光学信息处理实验和光学 图像加密实验。 关键词：光学图像加密；双随机相位编码；分数傅里叶变换；变形分 数傅里叶变换；数字仿真 8 华南师范大学硕士研究生学位论文 华南师范大学硕士研究生学位论文 Abstraet Abstract Optical technology is enjoying more and more attention due to its application into the data protection and encryption concerning our national as well as financial safety．The formulation of double random phase encoding technology，a part of the optical technology for encrypting images，helps a lot in perfecting optical technology in question．In order to explore for the technology deeply，this thesis，based on the job done before，is doing something significant in the research on the system of photoelectric images encryption． First of all，this thesis gives a general introduction to the application of data security system into the optical intention，which is followed by a discussion about the two optical methods employed in safety authentication as well as a look-back into how double random phase encoding is being developed in recent years both at home and abroad． Secondly，this thesis does a research on double random encoding theory in Fourier transform domain with the help of computer simulation， and discusses two typical optical image encryption technologies．A special attention is paid to the detailed discussion about the polarization encoding principle and conditions for modulating phase，which both depend on the spatial light modulator used in the job of this thesis． Thirdly，this thesis makes a detailed introduction about fractional Fourier transform recently applied into the optical image encryption as well as a discussion about the relation between the two dimensional fractional Fourier transform and the Fresnel diffraction．It also introduces the optical implementation of fractional Fourier transform．A research is carried out on the fast algorithm