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

Light Field Imaging in the Restrictive Object Space based on Flexible Angular Plane