A two-step calibration method of lenslet-based light field cameras

摘要

The calibration of lenslet-based light field camera is the key issue to many applications, especially the three-dimensional shape measurement. In this paper, a two-step physically based calibration method is proposed, where every parameter is described with its own physical meaning. The parameters about the main lens of the light field camera are calibrated with the central sub-aperture image, and the parameters about the micro-lens array are calibrated with the epipolar images, subsequently. To improve the calibration result, the distortion correction of the main lens and a nonlinear optimization method are applied also. The calibration method is validated with a commercially available light field camera and compared to Dansereau's calibration method. Typical RMS reprojection errors are 0.0017, 0.0032 mm for 30.0, 35.1 mm calibration grids.