Calibration method of light-field camera for photogrammetry application

摘要

As a novel imaging method, the light-field camera can extract different ray traces in the space due to the micro-lens array fixed ahead of the imaging sensor. However, when it is used in photogrammetry such as light pen orientation, attitude estimation and indoor navigation, the classical collinear constraint cannot be applied directly since the refraction effect from the main lens. Therefore, this paper has proposed a mathematical model to calibrate the positions of sub-apertures on the main lens by using bundle adjustment algorithm. Firstly, the reference position for the sub-apertures will be calibrated by using center sub-aperture images. Secondly, the virtual imaging points of the target bar through different sub-apertures can be obtained by the focal length of the main lens. Then the sub-apertures on the main lens can be calculated by using bundle adjustment algorithm. Finally, the experiments results verified the accuracy and effectiveness of the proposed method. (C) 2019 Elsevier Ltd. All rights reserved.