Tetsushi Wakabayashi Umapada Pal Fumitaka Kimura Yasuji Miyake F-ratio Based Weighted Feature Extraction for Similar Shape Character Recognition. 196-200 2009 ICDAR http://dx.doi.org/10.1109/ICDAR.2009.197 conf/icdar/2009 db/conf/icdar/icdar2009.html#WakabayashiPKM09