光场成像中元素图像的不失真条件  

Distortionless condition for microlens images in light field imaging

作　　者：杨尚鹏 许成才 颉一凡 周光泉[1] 周平[1] YANG Shang-peng;XU Cheng-cai;JIE Yi-fan;ZHOU Guang-quan;ZHOU Ping(School of Biological Sciences and Medical Engineering,Southeast University,Nanjing 210096,China)

机构地区：[1]东南大学生物科学与医学工程学院,江苏南京210096

出　　处：《液晶与显示》2023年第6期829-834,共6页Chinese Journal of Liquid Crystals and Displays

基　　金：国家自然科学基金(No.52071075)。

摘　　要：在实际应用中,受应用环境狭小空间的限制,可能出现元素图像偏移与部分缺失等失真问题,进而影响光场图像的解码、深度估计与三维成像等应用。为了研究该问题,本文分析并提出了元素图像不失真条件。将环境空间的约束抽象为主透镜物空间的孔阑,根据孔阑尺寸、位置与元素图像之间的关系,将光场成像分为3种情况分别进行理论研究,并设计了元素图像中心偏移、孔阑等差移动10 mm实验进行验证。实验结果表明,元素图像中心偏移的实验结果与理论分析的相关性高于99%,孔阑等差移动测量值为(9.97±1.5)mm,验证了本文元素图像不失真条件的正确性。该不失真条件可用于指导光场成像系统设计,定量分析元素图像失真参数。The microlens image may serve deviations from the true projected centers and shape irregularities when the light field imaging system is used in narrow space.This paper analyzed and proposed the distortionless condition for microlens images.The narrow space is modeled as an additional aperture in the light field imaging system,whose pupil size and position in the light field imaging system were related to the distortionless condition.The distortionless condition was studied from three aspects and the experiments were designed including microlens image deviation and arithmetic aperture-shift.Experimental results show the correlation coefficient between the experimental and theoretical result is more than 99%,and aperture-shift measurement is(9.97±1.5)mm.The distortionless condition is proved by experimental results,which can be used to guide the design of light field imaging system and analyze the microlens image distortion parameters quantitatively.

关 键 词：光场成像 孔阑 元素图像失真 元素图像偏移 

分 类 号：O436.1[机械工程—光学工程]