Yu-Pao Tsai Ching-Che Kao Yi-Ping Hung Zen-Chung Shih Real-Time Software Method for Preserving Eye Contact in Video Conferencing. 1001-1017 2004 20 J. Inf. Sci. Eng. 5 http://www.iis.sinica.edu.tw/page/jise/2004/200409_11.html db/journals/jise/jise20.html#TsaiKHS04