Seamless Switching of Shared Virtual and Augmented Environments for Collaboration Support

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  • Kiyokawa Kiyoshi
    Communications Research Laboratory, Ministry of Posts and Telecommunications
  • Takemura Haruo
    Graduate School of Information Science, Nara Institute of Science and Technology
  • Yokoya Naokazu
    Graduate School of Information Science, Nara Institute of Science and Technology

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  • 仮想環境と拡張環境のシームレスな切替による協調作業支援手法(<特集>複合現実感)

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Abstract

We propose seamless view-mode switching, a novel technique for supporting spatial collaboration that integrates a shared virtual environment (SVE) and a shared augmented environment (SAE) in a natural way. The technique uses two view modes: a see-through mode and a blind mode, each corresponds to SAE and SVE, respectively. In the initial state, the view mode is the see-through one. Whenever a user changes his/her location or a scaling factor by using a 3-D widget, the view mode is automatically switched to the blind one. In this mode, a computer graphics (CG) human body, which includes a head and two arms, is displayed in place ofa real partner. When a user chooses the see-through mode by using the widget, position, orientation and a scaling factor are changed to those of the partner gradually, and then the view mode is switched back to the see-through one. In addition to this seamless view-mode switching, we also employ two techniques for collaboration support. First, the system optionally draws a line from the center of the partner's eyes toward his/her viewing direction to enhance face direction information. Second, the system employs two methods for precise calibration of virtual environments: a look-up-table based mechanism for correcting the distorted magnetic field, and a Kalman filter for compensating the computational delay. Owing to these techniques, users of our system can smoothly perform spatial collaboration.

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