[Greg McKaskle]

I used the approach that was used for 2012 and the white paper. The approach is to inspect each particle to see if it is a good hollow rectangle. It does this by calculating a handful of simple measurements and scoring them to how a rectangle would score. The last step is to compare the scores to thresholds to determine how non rectangular you will allow the particles to be.

I'd suggest you compare your approach to the ones in the paper and identify the differences, the shortcuts, and things you'd like to modify.

If you have any questions, ask away.

Greg McKaskle