Introduction
Protractor is a modified version of $1 recognizer by Wobbrock that is mean to decrease the memory and processing requirements for unistroke gestures so that gesture recognition is feasible on systems with less capable hardware, such as mobile devices like Android phones. Li introduces changes to the classification algorithm that measures the total angular distance between pre-processed templates and a new un classified gesture. This angle measure is enhanced by calculating the optimal angle to rotate the template by so that it best matches the unknown gesture.
Additionally protractor employed a simple method of orientation variance by breaking the orientation up into 8 cardinal directions.
Discussion
Protractor is a practical implementation of gesture recognition for mobile phones. I think that mobile applications are the most obvious use for simple gestures and having an efficient and simple gesture recognition system makes including gestures into mobile applications much easier for developers.
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