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1998
Book Article
Titel
A vision based system controlling the virtual tables camera
Abstract
The paper focuses on an adaptation of a virtual camera to a horizontal stereoscopic protection (Virtual Table). To get the correct view to stereoscopic projections it is necessary to detect the user's position while walking around the table. One disadvantage of solutions based on magnetic trackers is their sensibility to distortions caused by external magnetic fields. Another unacceptable point is the obstructive cable connection of the user. An alternative video based method has been developed which frees the user from carrying any special equipment (exept of the stereo glasses). Its main requirements are robustness at real time conditions. The presented algorithm is based on the calculation of conditional probabilities by using chrominance histograms and additional methods to stabilise the detection results against noisy video signals and multiple observers included in a video image. It results in a combined x-, y-, and z-position enabling the render system to generate an adaptive view of the stereoscopic scene matching the users position and the virtual camera of the table.