1. Two-dimensional infrared sensor Pana-Eye;Yoshiike;National Tech. Report,1993
2. Human information sensor;Yoshiike,1993
3. 360 ° type human information sensor;Kawaguri;National Tech. Report,1997
4. Human information sensor;Morinaka,1997
5. Algorithm for counting the number of persons using IR image processing;Nakamura,1994