Silvio Ricardo Rodrigues Sanches,  Antonio Carlos Sementille,  Romero Tori. 

An essential task in immersive telecommunicationsystems is segmentation, i. e., the extractionof the actor from its original context in orderto integrate it in a 3d environment. Moderntechniques for video seg- mentation are appliedin virtual studios based on dedicated hardware.This paper presents a method for real-time videosegmentation, based on chroma-key technique, forteleimmersion apllications. This method providesquality in foreground silhouette cut and smoothnessintegration between real image and virtualenvironment using imperfect background andconventional hardware to capture the source image.

http://www.lbd.dcc.ufmg.br/colecoes/svr/2009/0016.pdf

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