A compact algorithm for rectification of stereo pairs
Machine Vision and Applications
Immersive Telecommunication Using Stereo Video Avatar
VR '01 Proceedings of the Virtual Reality 2001 Conference (VR'01)
High Presence Remote Presentation in the Shared Immersive Virtual World
VR '03 Proceedings of the IEEE Virtual Reality 2003
Hydra: Multiple People Detection and Tracking Using Silhouettes
VS '99 Proceedings of the Second IEEE Workshop on Visual Surveillance
blue-c: a spatially immersive display and 3D video portal for telepresence
ACM SIGGRAPH 2003 Papers
The Hedgehog: A Novel Optical Tracking Mecbod for Spatially Irnmersive Displays
VR '05 Proceedings of the 2005 IEEE Conference 2005 on Virtual Reality
Multimedia integration into the blue-c API
Computers and Graphics
Hi-index | 0.00 |
We present a novel method for merging a live video stream of multiple users into a shared virtual world in a large VR display environment. Collaborators at a remote site can be displayed in a virtual world as video textures to support visual communication more efficiently. To generate the video texture of a user in a dynamic background environment such as a CAVETM-like system, we use a camera pair which consists of two gray-scale cameras with band-pass filters, and two color cameras. The gray-scale cameras capture infrared images in which the dynamic background on the screen is eliminated, having only the infrared light reflected by the person. This makes it easy to extract the user's silhouette robustly. Using projection histogram we found rough position of the all users' head in the image. We can then find exact corresponding points using cross-correlation between two user silhouette images to determine the 3D position of each user. The extracted user silhouette is warped by rectification and translated to fit into a color image. We can now generate a video texture of the user by masking the background of the user in the color image. Each video texture is then transmitted to a remote site and displayed on a billboard in virtual space.