Hisayuki Tatsumi Yasuyuki Murai Masahiro Miyakawa RFID for aiding the visually impaired recognize surroundings. 3719-3724 2007 SMC http://dx.doi.org/10.1109/ICSMC.2007.4414119 conf/smc/2007 db/conf/smc/smc2007.html#TatsumiMM07