A Head Tracking Method Using Bird's-Eye View Camera and Gyroscope.

Kiyohide Satoh Shinji Uchiyama Hiroyuki Yamamoto A Head Tracking Method Using Bird's-Eye View Camera and Gyroscope. 202-211 2004 conf/ismar/2004 ISMAR http://doi.ieeecomputersociety.org/10.1109/ISMAR.2004.3 db/conf/ismar/ismar2004.html#SatohUY04