Seiichi Uchida Ryoji Hattori Masakazu Iwamura Shinichiro Omachi Koichi Kise Conspicuous Character Patterns. 16-20 2009 ICDAR http://dx.doi.org/10.1109/ICDAR.2009.196 conf/icdar/2009 db/conf/icdar/icdar2009.html#UchidaHIOK09