Megumi Saito Hiroshi Kashiwagi Yoichi Sato Katsushi Ikeuchi Measurement of Surface Orientations of Transparent Objects Using Polarization in Highlight. 1381- 1999 conf/cvpr/1999 CVPR http://computer.org/proceedings/cvpr/0149/volume1/01491381abs.htm db/conf/cvpr/cvpr1999.html#SaitoKSI99