Paper
Paulson, Brandon, and Tracy Hammond. "Paleosketch: accurate primitive sketch recognition and beautification." Proceedings of the 13th international conference on Intelligent user interfaces. ACM, 2008.
Notes
Paleosketch is a good primitive recognition engine which supports many different types of shapes. Not only does this paper include a number of useful shape test algorithms, it also introduces two new features common in sketch recognition today -- the Normalized Distance between Direction Extremes (NDDE) and the Direction Change Ratio (DCR).
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