We present a novel method for estimating 3-D positions of near light sources by using highlights on the outside and inside of a single clear hollow sphere. Conventionally , the positions of near light sources have been estimated by using observed highlights on multiple reference objects, e.g. mirror balls.
(a) Flashlight with lens and reflector (b) Setup for estimation (c) Captured image (d) Relighting result using 4-D light field (e) Relighting result using 2-D light field Fig. 1. Experimental setup and comparison of experimental results. Abstract—This paper proposes a linear estimation method for 4-D illumination light field using an inverse lighting… (More)