This paper presents a unistroke alphanumeric character writer. In this system, the user will mimic writing the character on the PC/gadget monitor without touching it and the character will be displayed. This is done by tracking the user’s fingertip by the convex hull algorithm. Closed or open fist controls the pen up and down mechanism. This can be achieved using angle detection. During pen-down, the recognizer continuously stores the points of the trajectory of the fingertip and converts it into a series of strokes. Extracted strokes are analyzed by using Dynamic Time Warp Matching Algorithm and the machine encoded text is outputted after. With this, the better cost for effective human-computer interaction can be achieved. Experimental results show roughly 90% recognition success rate.
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