Journal of Graphic Science of Japan
Online ISSN : 1884-6106
Print ISSN : 0387-5512
ISSN-L : 0387-5512
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Volume 43, Issue 3
Displaying 1-2 of 2 articles from this issue
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Research Paper
  • Variations of solid geometric objects that maintain a constant height when moved
    ―Elliptical arcs that replace circular arcs in “Two Ellipse Roller” and “A study of tangible−K”―
    Toshio MURAMATSU
    2009 Volume 43 Issue 3 Pages 3-9
    Published: 2009
    Released on J-STAGE: August 01, 2017
    DOIhttps://doi.org/10.5989/jsgs.43.3_3
    JOURNAL FREE ACCESS
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    For some time I have created a number of large three− dimensional objects that can be rolled on a flat surface. These objects are made out of stainless steel pipes and designed from the point of view of the plastic arts. Viewers can touch and move the objects while appreciating changes in visual appearance. One of these objects, entitled “Two−Circle−Roller” is contains two connected disks ; another is a half−disk entitled “Sphericon.” In recent years I have altered the shape of such objects by changing circular arcs to elliptical ones. These objects still move smoothly across a flat surface. I am exploring the possibilities of changing centers of gravity of objects of a constant height resulting from elliptical arcs. By creating these objects I have also succeeded in demonstrating that their actual production is possible.
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  • Projections among the World-coordinate Plane and Image Planes and the Calibration of Extrinsic Parameters of MulticameraSystem
    Takashi WATANABE, Tamae EMA
    2009 Volume 43 Issue 3 Pages 11-17
    Published: September 30, 2009
    Released on J-STAGE: August 01, 2017
    DOIhttps://doi.org/10.5989/jsgs.43.3_11
    JOURNAL FREE ACCESS
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    In this paper, we present a method which uses the trajectories of an object moving on a physical plane and simultaneously calibrates multiple cameras. This method can be useful for stereo visions and an intelligent multi-camera monitoring system. It is assumed that the extrinsic parameters of one camera are calibrated and the intrinsic parameters of each camera are known. Two approaches are introduced. One uses the projection among the image coordinates of the cameras, and the other handles the relation among cameras’ image coordinates and the world coordinate. The results obtained by these two approaches are compared with the result presented by the standard method and their utility is examined.
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