单幅自干涉非相干同轴全息重建

发布时间：2018-04-30 12:44

本文选题：数字全息 + 离散光信号处理　；参考：《光电子·激光》2016年05期

【摘要】：为解决离轴自干涉非相干数字全息(SIDH)图由于受到包络函数的调制使得其再现像质量远低于同轴全息图这一问题,提出基于单幅同轴SIDH图的压缩感知(CS)重建方法。首先建立与SIDH的光学记录和再现物理过程相适应的传感矩阵,从理论构建数值重建算法框架;然后,基于SIDH光路,以多个离散点源、LED和分辨率板作为待测物,分别进行计算机数值模拟及实验研究。研究结果表明,与传统反向传播重建方法相比,本文重建方法可基于单幅同轴SIDH图进行数值重构,并有效抑制孪生像及自相关成分信息的干扰;与采用4幅全息图进行计算的相移法相比,采样数据为原来的25%,而且本文方法得到的再现光场与采用四步相移法相比得到再现光场的相关度高达0.97;与目前离轴光路记录的SIDH再现结果相比,再现像质量得到大幅度的提高。
[Abstract]:In order to solve the problem that the reconstructed image quality of off-axis self-interference incoherent digital holograms is much lower than that of coaxial holograms due to the modulation of envelope function, a compression sensing SIDH image reconstruction method based on single coaxial SIDH image is proposed. Firstly, a sensing matrix suitable for optical recording and reproducing physical process of SIDH is established, and a numerical reconstruction algorithm framework is constructed from theory. Then, based on SIDH optical path, several discrete point source LEDs and resolution boards are used as the object to be tested. Computer numerical simulation and experimental study were carried out respectively. The results show that, compared with the traditional back-propagation reconstruction method, the proposed reconstruction method can be reconstructed numerically based on a single coaxial SIDH image, and can effectively suppress the interference of the twinning image and autocorrelation information. Compared with the phase shift method using four holograms, The sample data is 25% of the original, and the correlation degree of the reconstructed light field obtained by this method is as high as 0.97 compared with the four-step phase-shift method, and the quality of the reconstructed image is greatly improved compared with the SIDH reconstruction result recorded in off-axis optical path.
【作者单位】：华南农业大学电子工程学院;
【基金】：国家自然科学基金(61307011,51505156)资助项目
【分类号】：TP391.41;O438.1

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