Toru Yamada Yoshihiro Miyamoto Yuzo Senda Masahiro Serizawa Video-Quality Estimation Based on Reduced-Reference Model Employing Activity-Difference. 3284-3290 2009 92-A IEICE Transactions 12 http://search.ieice.org/bin/summary.php?id=e92-a_12_3284 db/journals/ieicet/ieicet92a.html#YamadaMSS09