基于微透镜阵列的光场成像系统

Light Field Imaging with Micro Lens Array

传统成像系统在拍摄过程中需要对目标物体准确对焦,这在拍摄快速变化的物体时显得非常无力.为了克服这一缺陷,本文以Levoy的光场渲染理论为基础,利用光学设计软件ZEMAX在普通成像系统中加入一个微透镜阵列,设计出一个由成像主镜、微透镜阵列和像面CCD探测器三部分组成的光场成像系统,并仿真模拟了光场图像的采集.这样的设计能够同时记录光线的强度和方向信息,对光场图像的后处理以傅里叶切片理论为基础,通过Matlab编程,实现了光场图像的重新聚焦.本文使用普通相机镜头、微透镜阵列和CCD探测器搭建了光场成像实验系统,实验采集光场图像并进行重聚焦处理,实现了三维物体的光场成像,验证了理论及算法的正确性.

For a traditional imaging system, it is necessary to focus accurately to take a picture of a scene. But sometime the system is incompetent when the objects change fast. Based on the light field rending theory, a light field imaging system is designed using a ZEMAX software to overcome the defect. The system consists of three parts： a main lens, a micro lens array, and a CCD. An original light field image is generated and recorded by the system. The system has an ability to record the intensity and direction of light rays. Then the object is refocused with the algorithm which is designed based on the Fourier slice theorem. At last, an experiment system is built up with common camera lens, a micro lens array, and a CCD. Experiment results demonstrate the validity of the theory and algorithm.