[1] FUJITSU LABS LTD, ATSUGI, KANAGAWA, JAPAN
[2] KDD CO LTD, RES & DEV LABS, KAMIFUKUOKA, SAITAMA, JAPAN
[3] NEC CORP LTD, C&C PROD TECHNOL DEV LABS, KAWASAKI, KANAGAWA, JAPAN
[4] NTT HUMAN INTERFACE LABS, ADV VIDEO PROC LAB, MUSASHINO, TOKYO, JAPAN
[5] TOSHIBA CO LTD, CTR RES & DEV, KAWASAKI, KANAGAWA, JAPAN