Felipe G. Carvalho,  Maurício Hofman,  Flávio Szenberg,  Alberto Raposo,  Marcelo Gattass. 

This work studies two occlusion problems inAugmented Reality: fiducial occlusion by real objects andvirtual-object occlusion. The proposal presented to treatsuch problems combines a technique to identify fiducialswith a technique that uses "ghost" objects in the depthbuffer.

http://www.lbd.dcc.ufmg.br/colecoes/warv/2005/0022.pdf

Processando consulta.