Yoshiyuki Mihara Akihiro Sugimoto Etsuya Shibayama Shin Takahashi An interactive braille-recognition system for the visually impaired based on a portable camera. 1653-1656 2005 conf/chi/2005a CHI Extended Abstracts http://doi.acm.org/10.1145/1056808.1056989 db/conf/chi/chi2005a.html#MiharaSST05