Refractive epitrochoids sampling for light field measurement using wedge prisms

Conventional light field measurement using a micro-lens array suffers from grid-like artifacts in the refocused image because the sub-aperture images are sampled at linear and equal intervals like a grid pattern. In this study, we propose a method for measuring light field using a pair of wedge prisms and a method for calibrating the sub-aperture position. The epitrochoids trajectory of rays generated by rotating prisms yields unequal intervals and variable sampling of the sub-aperture position. We designed and calibrated the optical system, and verified the effectiveness of the proposed method on refocused images using the measured light field.