Journal of Graphic Science of Japan
Online ISSN : 1884-6106
Print ISSN : 0387-5512
ISSN-L : 0387-5512
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Volume 17, Issue 2
Displaying 1-8 of 8 articles from this issue
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  • Variation-Range of Axonometric Co-ordinate System in Oblique Projection
    Kazuhiko TAKEYAMA
    1983 Volume 17 Issue 2 Pages 3-8
    Published: 1983
    Released on J-STAGE: August 25, 2010
    DOIhttps://doi.org/10.5989/jsgs.17.2_3
    JOURNAL FREE ACCESS
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    In the parallel projection, the distortions of the oblique ones to the orthogonal projection can be described by the angle made when projecting lines and image plane cross. This paper shows the variation-range of the axonometric co-ordinate system, consisting of the image unit and the angle of adjacent image axes, in the case of the oblique projection in which the angle made by the projecting line and the image plane is constant.
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  • On the Developability of the Ruled Surface to form the Curved Gradient
    Masayuki IKEUTI
    1983 Volume 17 Issue 2 Pages 9-14
    Published: 1983
    Released on J-STAGE: August 25, 2010
    DOIhttps://doi.org/10.5989/jsgs.17.2_9
    JOURNAL FREE ACCESS
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    In this paper the author suggests a drawing method to discriminate between the developable surface and the skew surface.
    The surface of the curved levee is a ruled surface of which the director is the levee normal line. The generator of the slope is the batter board. The gradient of the batter board is much steeper than the gradient of the director. So the surface of the curved levee is not the convolute of the levee normal line.
    The developable surface has the generator: (1) parallel to each other, (2) concurrent with a point, and (3) tangent to a space curve. So drawing the projection of the generator, the developable surface can be dis-criminated.
    Three types of the curved levee were discriminated. The first was a skew surface, the second was a part of a convolute of an other helix, and the third was a part of a cone.
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  • Application of Picture Processing to Ultrasonic Tomography
    Tatsuhiko AIZAWA, Kenjiro SUZUKI, Saburo NAGANO, Hiroshi ISODA
    1983 Volume 17 Issue 2 Pages 15-20
    Published: 1983
    Released on J-STAGE: August 25, 2010
    DOIhttps://doi.org/10.5989/jsgs.17.2_15
    JOURNAL FREE ACCESS
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    Digital picture processing is widely used in almost every field of engineering with aid of computer and optoelectronics. In recent years the ultrasonic imaging with use of digital processing technique grows more important in the computer tomo-graphic scanning for medical examination or nondestructive testing. But there are very few papers about the fundamental research of ultrasonic imaging. In the present paper, we have made the underwater ultrasonic imaging system using microcomputers and discussed the power of resolution in the horisontal plane and the appropriate method for three dimensional display of ultrasonic image. Through some experiments the objects under water can be resolved and recognized with the error of at least 1.5mm. The psudo-color representation, edge-enhancement and isometric display are found to be effective to understand the three dimensional figure of objects.
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  • On the Representation of the Wheels of Cow Carriages (Gissha) in old Japanese Picture Scrolls
    Tamotsu TANAKA
    1983 Volume 17 Issue 2 Pages 21-31
    Published: 1983
    Released on J-STAGE: August 25, 2010
    DOIhttps://doi.org/10.5989/jsgs.17.2_21
    JOURNAL FREE ACCESS
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    We have investigated the wheel profiles of cow carriages described in old Japanese scrolls, which are elliptical in shape and abnormally big.
    Taking up 67 carriges represented on the 11 scrolls in the 12th and 13th centuries available to us now, we have measured each of them in size and angle of the ellipses made approximate to the wheel profiles and also in dimensions of the carriages.
    The results are as follows:
    (1) Condidering varieties found in these pictures, we should not decide hastily that there was any particular, conventional pattern of expression for the scroll painters.
    (2) With most of the cow carriages described, the dimension of the minor axis of the ellipse is extremly close to the lateral length of the body, l.
    (3) The picture of a carriage seems to be a composition of two independent images of its body and wheel, the latter of which takes on an ellipse with the length of the minor axis of l.
    (4) The facts mentioned above suggest that the diameter of the original wheel is equal to l. Thus, it can be interpreted that the major axis of an ellipse is larger than its diameter apparently, and so the size of an wheel becomes bigger vertically than the original.
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  • [title in Japanese]
    [in Japanese]
    1983 Volume 17 Issue 2 Pages 33-35
    Published: 1983
    Released on J-STAGE: August 25, 2010
    DOIhttps://doi.org/10.5989/jsgs.17.2_33
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1983 Volume 17 Issue 2 Pages 36-41
    Published: 1983
    Released on J-STAGE: September 07, 2010
    DOIhttps://doi.org/10.5989/jsgs.17.2_36
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1983 Volume 17 Issue 2 Pages 42-48
    Published: 1983
    Released on J-STAGE: December 09, 2010
    DOIhttps://doi.org/10.5989/jsgs.17.2_42
    JOURNAL FREE ACCESS
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  • ERRATUM
    1983 Volume 17 Issue 2 Pages 51
    Published: 1983
    Released on J-STAGE: August 25, 2010
    DOIhttps://doi.org/10.5989/jsgs.17.2_51
    JOURNAL FREE ACCESS
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