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CITATION

Bo Yu, Shijie Cai

GRAPHITE '03 Proceedings of the 1st international conference on Computer graphics and interactive techniques in Australasia and South East Asia

Publication Link: http://dl.acm.org/citation.cfm?id=604499

Summary:

This paper allows the users to draw in a very natural way. The process is divided into two steps: imprecise stroke approximation and post-process. In imprecise stroke approximation, it divides the work in four steps: Vertex detection, Line segment approximation, curve approximation and self-Intersection strokes. The feature area here can be calculated here to a line, to a point or to an arc. The vertex detection and primitive shape approximation is divided into an incremental procedure. Feature area verification is done while identifying line segment, Curves are identified with help of their direction graph and the value of slope. It follows two heuristic rules: simpler is better and specific is better.

Post process involves simple relation retrieval, cleanup and basic object recognition. It eliminates false noisy elements. It specifies the rules for identifying whether or not to remove  or shorten or merge a line/arc,

Discussion:

The method provides good accuracy for polylines and primitive shapes, but the accuracy drops very much while dealing with hybrid shapes. I like the fact that the system and metrices used are easy to follow and use.