Ender Tekin James M. Coughlan Huiying Shen Real-time detection and reading of LED/LCD displays for visually impaired persons. 491-496 2011 WACV http://dx.doi.org/10.1109/WACV.2011.5711544 conf/wacv/2011 db/conf/wacv/wacv2011.html#TekinCS11