ITE Technical Report
Online ISSN : 2433-0914
Print ISSN : 0386-4227
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Volume 14, Issue 70
Displaying 1-6 of 6 articles from this issue
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  • [title in Japanese]
    Article type: Cover
    1990 Volume 14 Issue 70 Pages Cover1-
    Published: November 29, 1990
    Released on J-STAGE: October 06, 2017
    DOIhttps://doi.org/10.11485/tvtr.14.70_Cover1
    RESEARCH REPORT / TECHNICAL REPORT FREE ACCESS
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  • [title in Japanese]
    Article type: Index
    1990 Volume 14 Issue 70 Pages Toc1-
    Published: November 29, 1990
    Released on J-STAGE: October 06, 2017
    DOIhttps://doi.org/10.11485/tvtr.14.70_Toc1
    RESEARCH REPORT / TECHNICAL REPORT FREE ACCESS
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  • Round-trip error diffusion method
    Tetsuo Iyoda, Naosuke Ino, Takao Koike
    Article type: Article
    1990 Volume 14 Issue 70 Pages 1-6
    Published: November 29, 1990
    Released on J-STAGE: October 06, 2017
    DOIhttps://doi.org/10.11485/tvtr.14.70_1
    RESEARCH REPORT / TECHNICAL REPORT FREE ACCESS
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    A noiseless digital halftoning technique is demanded with the advance of the digital printers'resolution. We select an ED (error diffusion) method as the best algorithm for this purpose and propose a new algorithm based on an ED method to reduce a textural noise peculiar to that method. The new algorithm is a round-trip ED method whose processing direction is periodically reversed. An improvement of a digitized image's quality with this modification has been observed in three experiments which are an MTF analysis of grayscale patch images, a comparison of textural noise interference between old and new methods and a sensual evaluation of digitized color image's quality.
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  • A Simple Digital Halftoning For Grayscale Image
    Naosuke Ino, Tetsuo Iyoda
    Article type: Article
    1990 Volume 14 Issue 70 Pages 7-12
    Published: November 29, 1990
    Released on J-STAGE: October 06, 2017
    DOIhttps://doi.org/10.11485/tvtr.14.70_7
    RESEARCH REPORT / TECHNICAL REPORT FREE ACCESS
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    This report describes a new simple digital halftoning method based on Error Diffusion and Ordered Dither. Diffusing error to scanning line direction only, the algorithm becomes very simple in comparison with conventional two dimensional diffusion. The two parameters of Error Diffusion period N in scanning direction and Dither period n in sub-scanning direction control respective natures independently. This algorithm can be used in simple method with medium image quality between that of conventional Error Diffusion and Ordered Dither. The image quality will be more excellent removing vertical texture originated in error diffusion period.
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  • Picture Quality Improvement in color video graphic printer
    Hiroaki Takano, Akio Hitachi, Shin Ohno
    Article type: Article
    1990 Volume 14 Issue 70 Pages 13-17
    Published: November 29, 1990
    Released on J-STAGE: October 06, 2017
    DOIhttps://doi.org/10.11485/tvtr.14.70_13
    RESEARCH REPORT / TECHNICAL REPORT FREE ACCESS
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    We developed a interporation technique suitable to a reproduction of still image pictures. This technique not only creates data to make a quasi-frame picture but also enables us to get crisp diagonal lines, essential to reproduce "good" still image pictures. In this presentation, we show one example to create those data and some print samples reproduced with this technique. We also briefly discuss the error rate of this technique.
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  • [title in Japanese]
    Article type: Appendix
    1990 Volume 14 Issue 70 Pages App1-
    Published: November 29, 1990
    Released on J-STAGE: October 06, 2017
    DOIhttps://doi.org/10.11485/tvtr.14.70_App1
    RESEARCH REPORT / TECHNICAL REPORT FREE ACCESS
    Download PDF (54K)
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