1. Introduction
Light field imaging [1] is becoming more and more popular in recent years. Unlike conventional images, which record the 2D projection of the scene by angularly integrating the light rays at each pixel, a light field describes the distribution of light rays. This allows us to capture spatial and directional information of light rays in our world. Due to the richer information and the particular structure of light fields, there are a growing number of applications involving this particular type of data, such as multi-perspective rendering [2], digital refocusing [3], synthetic aperture imaging [4] and much more.