Ricardo Nakamura,  Romero Tori. 

In this paper, we present a technique for collision detection anduser interaction between a real-time video avatar and the objectsof mixed reality environments. Differently from other similarworks, it is aimed at low-cost educational applications and homeentertainment systems, consisting of a personal computer andlow-resolution "webcams." The proposal for such technique isdescribed, along with a discussion of results from an implementedprototype.

http://www.lbd.dcc.ufmg.br/colecoes/svr/2007/0012.pdf

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