Affiliation: | (1) Department of Information and Communication Engineering, School of Engineering, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan, E-mail: {chen,santi,dohi,ishizuka}@miv.t.u-tokyo.ac.jp, JP;(2) Department of Computer Science and Information Engineering, National Chi-Nan University, 1, University RD, Puli, Nan-Tou, Taiwan 545, R.O.C., E-mail: lhchen@csie.ncnu.edu.tw, TW |