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Makoto Sato
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Journal Articles
Publisher: Journals Gateway
Presence: Teleoperators and Virtual Environments (2002) 11 (2): 134–143.
Published: 01 April 2002
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This paper describes the construction of a prototype system that allows the user to manipulate virtual objects in a mixed-reality environment. The user can perceive haptic sensations at his or her fingertips and see a virtual world with a live image of his or her hands manipulating the virtual objects. The difficulty of constructing such a visual presentation is the problem of merging the real image with correct geometrical occlusion with images of virtual objects in the simulated virtual world. In this paper, a method of solving registration of real and virtual images to produce mixedreality scenes is proposed. We have combined this method with our haptic interface device, SPIDAR-8, to construct a system that integrates these realities by using the sense of touch and vision of real images in the virtual world that can be realized during the manipulation of virtual objects. The implemented results are shown and remaining problems are discussed.
Journal Articles
Publisher: Journals Gateway
Presence: Teleoperators and Virtual Environments (1994) 3 (4): 351–359.
Published: 01 November 1994
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This research aims at the realization of a networked virtual environment for the design of three-dimensional (3-D) objects. Based on an analysis of an ordinary collaborative design, we illustrate that a collaborative work space consists of a dialog space and an object space . In the dialog space, a participant interacts with partners, and in the object space with an object. The participants enter the dialog space and the object space in turn, appropriately. In addition, collaborative design of 3-D objects is carried out with multimodal interactions: visual, auditory, and haptic. A networked virtual environment must support these interactions without contradiction in either time or space. In this paper, we propose a networked virtual environment for a pair of participants to satisfy the conditions described above. To implement the networked system, we take into account the necessity of visual, auditory, and haptic interactions, the need for participants to switch between the dialog space and the object space quickly and appropriately, and human ergonomics on the functional space of hands and eyes. An experiment on hand-over task was done to investigate the effect of the networked haptic device with the proposed system. Object layout tasks, such as toy block layout, office furniture layout, city building layout, etc., can be performed by using this environment.
Journal Articles
Publisher: Journals Gateway
Presence: Teleoperators and Virtual Environments (1994) 3 (1): 81–86.
Published: 01 February 1994
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This paper describes a 3D kinesthetic interface device using tensed strings. The results of the experiments on pick-and-place tasks show that not only sensations of collision but also weights of virtual objects are important in virtual environments.