基于多视角合成孔径的太赫兹光场成像去遮挡算法研究  

Terahertz Light Field Imaging Occlusion Removing Algorithm Based on Multi-Perspective Synthetic Aperture

作　　者：杨墨轩 赵源萌[1,2,3,4] 朱凤霞 张宏飞 李志龙 张存林 Yang Moxuan;Zhao Yuanmeng;Zhu Fengxia;Zhang Hongfei;Li Zhilong;Zhang Cunlin(Key Laboratory of Terahertz Optoelectronics,Ministry of Education,Beijing 100048,China;Beijing Key Laboratory for Terahertz Spectroscopy and Imaging,Beijing 100048,China;Beijing Advanced Innovation Center for Imaging Theory and Technology,Beijing 100048,China;Department of Physics,Capital Normal University,Beijing 100048,China)

机构地区：[1]太赫兹光电子学教育部重点实验室,北京100048 [2]太赫兹波谱与成像北京市重点实验室,北京100048 [3]北京成像理论与技术高精尖创新中心,北京100048 [4]首都师范大学物理系,北京100048

出　　处：《光学学报》2022年第9期88-95,共8页Acta Optica Sinica

基　　金：国家自然科学基金(61875140);首都师范大学分类发展-学位点建设与研究生教育立项及研究生高水平学术创新项目(008-2155089);科技创新服务能力建设-基本科研业务(20530290044)。

摘　　要：针对太赫兹光场成像中由前景遮挡物影响感兴趣信息采集的问题,提出基于多视角合成孔径的太赫兹光场成像去遮挡算法。在分析太赫兹光场成像数字重聚焦原理的基础上,首先使用太赫兹焦平面阵列相机来采集太赫兹光场的原始数据,然后通过确定最小泛化误差来定位数字重聚焦深度,最后应用经验模式分解(EMD)法对重构图像进行增强处理,得到目标物轮廓分明、抑制遮挡物干扰的太赫兹图像。实验结果表明,太赫兹光场技术与合成孔径技术的结合可有效降低遮挡物的影响,另外证实了EMD法具有改善太赫兹图像质量的能力。In order to solve the problem that the acquisition of interesting information is affected by foreground occlusion in terahertz field imaging,a terahertz light field imaging occlusion culling algorithm based on multiperspective synthetic aperture is proposed.Based on the analysis of digital refocusing principle of terahertz light field imaging,the original data of the terahertz light field is collected by using a terahertz focal plane array camera,and the depth of digital refocusing is located by determining the minimum generalization error.Finally,the reconstructed image is enhanced by using empirical mode decomposition(EMD)method.The terahertz image of the object with clear contour and interference suppression is obtained.The experimental results show that the combination of terahertz light field technology and synthetic aperture technology can effectively reduce the influence of occlusion,and it is proved that EMD method has the ability to improve the quality of terahertz image.

关 键 词：成像系统 太赫兹成像 光场 合成孔径 去遮挡 

分 类 号：O436[机械工程—光学工程]