IWAR99.kato - Marker Tracking and HMD Calibration for a...

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Marker Tracking and HMD Calibration for a Video-based Augmented Reality Conferencing System Hirokazu Kato 1 and Mark Billinghurst 2 1 Faculty of Information Sciences, Hiroshima City University 2 Human Interface Technology Laboratory, University of Washington kato@sys.im.hiroshima-cu.ac.jp, grof@hitl.washington.edu CSCW; in this setting computers can provide the same type of collaborative information that people have in face-to-face interactions, such as communication by object manipulation, voice and gesture [1]. Work on the DIVE project [2], GreenSpace [3] and other fully immersive multi-participant virtual environments has shown that collaborative work is indeed intuitive in such surroundings. However most current multi-user VR systems are fully immersive, separating the user from the real world and their traditional tools. As Grudin [4] points out, CSCW tools are generally rejected when they force users to change the way they work. This is because of the introduction of seams or discontinuities between the way people usually work and the way they are forced to work because of the computer interface. Ishii describes in detail the advantages of seamless CSCW interfaces [5]. Obviously immersive VR interfaces introduce a huge discontinuity between the real and virtual worlds. An alternative approach is through Augmented Reality (AR), the overlaying of virtual objects onto the real world. In the past researchers have explored the use of AR approaches to support face-to-face collaboration. Projects such as Studierstube [6], Transvision [7], and AR2 Hockey [8] allow users can see each other as well as 3D virtual objects in the space between them. Users can interact with the real world at the same time as the virtual images, bringing the benefits of VR interfaces into the real world and facilitating very natural collaboration. In a previous paper we found that this meant that users collaborate better on a task in a face-to-face AR setting than for the same task in a Abstract We describe an augmented reality conferencing system which uses the overlay of virtual images on the real world. Remote collaborators are represented on Virtual Monitors which can be freely positioned about a user in space. Users can collaboratively view and interact with virtual objects using a shared virtual whiteboard. This is possible through precise virtual image registration using fast and accurate computer vision techniques and HMD calibration. We propose a method for tracking fiducial markers and a calibration method for optical see-through HMD based on the marker tracking. 1. Introduction Computers are increasingly used to enhance collaboration between people. As collaborative tools become more common the Human-Computer Interface is giving way to a Human-Human Interface mediated by computers. This emphasis adds new technical challenges to the design of Human Computer Interfaces. These challenges are compounded for attempts to support three-dimensional Computer Supported Collaborative Work (CSCW).
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IWAR99.kato - Marker Tracking and HMD Calibration for a...

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