提出了一种基于压缩感知(CS)和干涉原理的双灰度图像加密方法。该方法分别从两幅灰度图像中随机提取50%的数据,并将这些数据通过融合形成一幅合成图像(SI)。再将该合成图像加密至三个纯相位板(POMs)中。其中一个随机相位板使用随机函数生成,另外两个通过解析的方法得到。解密时,利用分束片对3 个POMs 的衍射场进行叠加,在光学解密装置中利用CCD 记录合成图像,再从合成图像中分别提取的两幅原始图像信息。尽管对于每一幅原始图像来说,只能准确提取其50%的数据,但是压缩感知重构算法可以高质量的重现这两幅原始图
在建立的一套反射式光纤共焦扫描成像系统上进行了标准板的扫描成像实验及反色、拼接等图像处理,得到了二维扫描像,并进行了二维共焦扫描像及离焦像的比较。实验结果表明,系统具有亚微米级横向分辨能力,并具有微米级纵向层析能力。
Creatinine (Cr) is a biochemical waste molecule generated from muscle metabolism and primarily cleared from the bloodstream by the kidneys. If kidney function declines, Cr levels in the blood tend to increase. Therefore, Cr serves as an indicator of kidne
This study introduced the research and development of a portable and miniaturized system for the measurement of the refractive index of sub-microliter liquid based on a microfluidic chip. A technical method of double-beam interference, was proposed for us
With the emergence of high-bitrate applications, cross stratum optimization (CSO) attracts the interest of network operators because of its application in the joint optimization of optical networks and application stratum resources. Given the large-scale
Non-volatile memory (NVM) devices with non-volatility and low power consumption properties are important in the data storage field. The switching mechanism and packaging reliability issues in NVMs are of great research interest. The switching process in N
本文从Fresne1-Kirchhoff衍射公式出发,直接由光强分布导出了散斑平均反差与表面粗糙度特征参数的关系公式,采用指数形式和高斯形式的自相关函数,得到极为相符的计算结果。利用激光衍射散斑平均反差测量表面粗糙度,具有精度高和分辨高等优点,可以用于测试精密表面的粗糙度。
提出了一个利用原子介质在光机械系统中产生纠缠的方案。研究结果表明,当腔场和原子介质间的耦合系数取合适值时,腔场和动镜,镜子与原子,以及腔场和原子之间 都是纠缠的。此外,考虑了腔场耗散效应,并给出用“logarithmic negativity”去度量系统纠缠的数值解。