ITE Technical Report
Online ISSN : 2433-0914
Print ISSN : 0386-4227
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Volume 13, Issue 27
Displaying 1-10 of 10 articles from this issue
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  • [title in Japanese]
    Article type: Cover
    1989 Volume 13 Issue 27 Pages Cover1-
    Published: May 26, 1989
    Released on J-STAGE: October 06, 2017
    DOIhttps://doi.org/10.11485/tvtr.13.27_Cover1
    RESEARCH REPORT / TECHNICAL REPORT FREE ACCESS
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  • [title in Japanese]
    Article type: Cover
    1989 Volume 13 Issue 27 Pages Cover2-
    Published: May 26, 1989
    Released on J-STAGE: October 06, 2017
    DOIhttps://doi.org/10.11485/tvtr.13.27_Cover2
    RESEARCH REPORT / TECHNICAL REPORT FREE ACCESS
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  • Tomographic Image Reconstruction from Incomplete Projection Data by the Method of Projection onto Convex Sets
    Hiroyuki KUDO, Tsuneo SAITO
    Article type: Article
    1989 Volume 13 Issue 27 Pages 1-8
    Published: May 26, 1989
    Released on J-STAGE: October 06, 2017
    DOIhttps://doi.org/10.11485/tvtr.13.27_1
    RESEARCH REPORT / TECHNICAL REPORT FREE ACCESS
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    In this paper, we derive a powerful algorithm for estimating missing line integrals in limited data computed tomography. We have formulated the estimation problem of missing line integrals in Radon space by the theory of projection onto convex sets (POCS) and utilized the Helgason-Ludwig consistency condition as a constraint in Radon space. Further, in order to stabilize the estimation process, we have used a priori knowledge about the rough shape of the object to be imaged. In the numerical experiments, it was confirmed that our method is superior to the previously reported algorithms from the view point of the computational cost and the image quality.
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  • Surgical Simulation System Based on Three-dimensional Imaging Technique
    Kentaro FURUHATA, Yasuzo SUTO
    Article type: Article
    1989 Volume 13 Issue 27 Pages 9-16
    Published: May 26, 1989
    Released on J-STAGE: October 06, 2017
    DOIhttps://doi.org/10.11485/tvtr.13.27_9
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    This paper discusses the development of a simulation system used in surgical planning based on a three dimensional imaging technique applied to computed tomograpy (CT) image data. The clinical application of three dimensional imaging technique has been materially advanced with the recent rapid development or computergraphics and CAD/CAN techniques. The system which we introduced in this study has been developed by the improvement of three dimensional display technique of its predecessor. Processing speed approximating a real time is realized by improving data compression and projection processing and it is applied to surgical simulation in neurosurgery and orthopcdics.
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  • Similar shape retrieval using a complex autoregressive model
    Iwao SEKITA, Takio KURITA, Nobuyuki OTSU
    Article type: Article
    1989 Volume 13 Issue 27 Pages 17-24
    Published: May 26, 1989
    Released on J-STAGE: October 06, 2017
    DOIhttps://doi.org/10.11485/tvtr.13.27_17
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    The complex autoregressive model we proposed as a shape descriptor has such a merit that the complex autoregressive coefficients are invariant for translation, rotation and dilatation of shapes. Those are also invariant for a start point of boundary tracking. In this paper, several distances for retrieving similar shapes are proposed based on the model. The distances can be seen to be natural extension of the distances based on the conventional autoregressive model. The properties of the distances are discussed, and effectiveness of the distances for shape retrieval is verified by some experiments.
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  • Analysis of Snowflake Shape by Image Processing
    Ken-ichiro MURAMOTO, Tohru SHIINA, Ken-ichi OHE
    Article type: Article
    1989 Volume 13 Issue 27 Pages 25-32
    Published: May 26, 1989
    Released on J-STAGE: October 06, 2017
    DOIhttps://doi.org/10.11485/tvtr.13.27_25
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    Falling attitudes of snowflakes were smultaneously photographed by two video cameras from horizontal and vertical directions, and these images were analyzed by an image processor and personal computer. The attitude of each snowflake was measured every 1/30 second frog! its two images. It is generally found that snowflake images from the top are larger than the ones from the side and some of snowflakes rotate during fall.
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  • Speedup of Image Processing using Multi DSP
    Katsuhiro MATSUNO, Kiyotsugu SATOH, Kazumi YAMASHITA
    Article type: Article
    1989 Volume 13 Issue 27 Pages 33-40
    Published: May 26, 1989
    Released on J-STAGE: October 06, 2017
    DOIhttps://doi.org/10.11485/tvtr.13.27_33
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    In this paper, we describe image processing system with multiprocessor manner and MLIP (Multiprocessor Language for Image Processing). Out image processing system is constructed from one master processor and four processor units with DSP (Digital Signal Processor). MLIP is the system software which is executed on the host computer. Using this MLIP, we are efficiently able to write image processing program and control this image processing system. In comparison with typical personal computer, speedup ratio has become from three times to seventy-three times.
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  • Features and a cleaning method of background noises on prints of monuments
    Jinling HU, Tadash KURATA
    Article type: Article
    1989 Volume 13 Issue 27 Pages 41-48
    Published: May 26, 1989
    Released on J-STAGE: October 06, 2017
    DOIhttps://doi.org/10.11485/tvtr.13.27_41
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    This paper discribes features and a cleaning method of background noises on prints of monuments. First, features of background noises are sutied on gray-level distributions, power spectrums and autocorrelation functions for cleaning methods. According to this study, some small dots of noises can only cleaned by filtering methods, but types of blots can't. The method now proposed is a means of surrounding direction changes of shapes. Changes per area and surrounding lengyh of these type noises are very effective to clean the prints. Experimental results are showen for the effective methode.
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  • Understanding complex figure with straight lines by using rotatable TV camera
    Jinling HU, Tadashi KURATA
    Article type: Article
    1989 Volume 13 Issue 27 Pages 49-56
    Published: May 26, 1989
    Released on J-STAGE: October 06, 2017
    DOIhttps://doi.org/10.11485/tvtr.13.27_49
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    It has been known that the human visual system uses non-uniformly distributed cone cells. This paper presents a methode of understandig complex figures with straight lines by simulated the hu-man visual system. A equipment is consited a two-axis rotatable TV camera, a computer and a TV monitor. Video signals are changed into non-uniformly resolution signals like a eye. If the TV camera catches a watchedpoint of figure, then the TV camera is rotated to analyze the figure at the high resolution area. Characters of figures can be extracted and sored in files to understand some figure.
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  • [title in Japanese]
    Article type: Appendix
    1989 Volume 13 Issue 27 Pages App1-
    Published: May 26, 1989
    Released on J-STAGE: October 06, 2017
    DOIhttps://doi.org/10.11485/tvtr.13.27_App1
    RESEARCH REPORT / TECHNICAL REPORT FREE ACCESS
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