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The blind use the stick to give them the direction
or prevent from danger.
But during crossing the intersection road they can’t recognize the path owing to there are no things to locate.
“blindstick” is made for blinds to deal with this situation.The SAFETY NAVI powered by the colorimeter to recognize the path on the road and the viberator give alarm while they are deviating.
Cheng-Wen Chang, Shih-Cheng Chen, Chin-Chieh Yang