In some applications, the object space of light field imaging system is restrictive, such as industrial and medical endoscopes. If the traditional light field imaging system is used in the restrictive object space (ROS) directly but without any specific considerations, the ROS will lead to severe microlens image distortions and then affects light field decoding, calibration and 3D reconstruction. The light field imaging in restrictive object space (ROS-LF) is complicated but significant. In this paper, we first deduce that the reason of the microlens image deviation is the position variation of the angular plane, then we propose the flexible angular plane for ROS-LF, while in the traditional light field the angular plane always coincides with the main lens plane. Subsequently, we propose the microlens image non-distortion principle for ROS-LF and introduce the ROS-LF imaging principle. We demonstrate that the difference is an aperture constant term between the ROS-LF and traditional light field imaging models. At last, we design a ROS-LF simulated system and calibrate it to verify principles proposed in this paper.

翻译：在一些应用中，如工业及医疗内窥镜，光场成像系统的物空间受到限制。若将传统光场成像系统直接用于受限物空间（ROS）而未作针对性设计，该受限物空间将导致微透镜图像出现严重畸变，进而影响光场解码、标定与三维重建。受限物空间光场成像（ROS-LF）复杂但具有重要意义。本文首先推导出微透镜图像偏差源于角度平面位置变化，继而针对ROS-LF提出柔性角度平面概念——传统光场中角度平面始终与主透镜平面重合。随后提出ROS-LF的微透镜图像无畸变原理并阐述ROS-LF成像原理。我们证明ROS-LF与传统光场成像模型之间的差异仅为一个孔径常数项。最后，设计并标定ROS-LF仿真系统以验证本文提出的各项原理。