Jianfeng Xu Toshihiko Yamasaki Kiyoharu Aizawa Key Frame Extraction in 3D Video by Rate-Distortion Optimization. 1-4 2006 conf/icmcs/2006 ICME http://doi.ieeecomputersociety.org/10.1109/ICME.2006.262499 db/conf/icmcs/icme2006.html#XuYA06