Yang Wang 0001 Dimitris Samaras Estimation of Multiple Directional Light Sources for Synthesis of Mixed Reality Images. 38-47 2002 conf/pg/2002 Pacific Conference on Computer Graphics and Applications http://doi.ieeecomputersociety.org/10.1109/PCCGA.2002.1167837 db/conf/pg/pg2002.html#WangS02