基于压缩感知的多图像加密新方法  

A new multiple-image encryption method based on compressive sensing

作　　者：王梦婷[1] 周昕[1] 呼有军 魏亚运 

机构地区：[1]四川大学电子信息学院,成都610065

出　　处：《激光杂志》2016年第3期38-41,共4页Laser Journal

基　　金：国家自然科学基金资助项目(61177009);教育部留学回国人员科研启动基金资助项目

摘　　要：为了解决传统双随机相位加密(DRPE)由于系统的线性特性而产生的缺陷问题,本文提出了基于压缩感知基础上多图像加密和解密的新方法,即将若干个与图像大小相同的振幅型空间光调制器分别放置在不同位置的不同图像前,通过调节空间光调制器的强度分布,被调制的一系列光束照射在不同图像上并最终被一个点探测器收集起来。理论分析得到光通过空间光调制器以及物体的过程就类似压缩感知中测量物体的观测矩阵,因此整个加密过程被看作压缩感知过程,解密过程就被转换成了求解最小化问题。仿真结果表明,该方法提高了加密的抗攻击性和鲁棒性,并且解密的图像质量是可以接受的。In order to solve the problems caused by the linear characteristic of the double -phase encoding （DRPE） system, a new approach to multiple-image optical encryption and deeryption based on compressive sensing （CS） is proposed. Several amplitude type spatial light modulators （SLM） which are the same size as objects, are set in front of different objects are used as a series of random-phase masks. By modifying the SLMs, sequence of modulated beams are injected on the objects, and a point detector collects all the lights passing through the objects. Through theoretical analysis, the reeoding process of light passing through SLMs and objects is like the measurement basis of measuring objects in CS. Thus the recording is regarded as a compressive sensing process, and the decryption proce- dure is treated as a minimization problem. According to the simulation results, the approach enhances robustness a- gainst attacks, and the qualities of decrypted images are acceptable.

关 键 词：压缩感知 多图像加密 空间光调制器 点探测器 

分 类 号：TN911[电子电信—通信与信息系统]