Using Entropy to Distinguish Shape Versus Text in Hand-Drawn Diagrams

Paper
Bhat, Akshay, and Tracy Hammond. "Using Entropy to Distinguish Shape Versus Text in Hand-Drawn Diagrams." IJCAI. Vol. 9. 2009.
Direct Link: http://ijcai.org/papers09/Papers/IJCAI09-234.pdf

Summary

In this paper, authors use entropy as a singular measure to distinguish between text and shapes in sketches.
The end product is a fairly accurate system that also outputs confidence for classification.

Discussion

Pros

A very elegant solution. I like the approach of encoding angular changes between smoothed stroke points.

Cons.

I can't think of any. Perhaps elaborating on some of the empirical decisions such as value for 'k' and other parameters and the effects of using alternative parameters would have been interesting.