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Article type: Cover
1985 Volume 9 Issue 15 Pages
Cover1-
Published: 1985
Released on J-STAGE: October 02, 2017
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Article type: Index
1985 Volume 9 Issue 15 Pages
Toc1-
Published: 1985
Released on J-STAGE: October 02, 2017
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Nobuhito MATSUSHIRO
Article type: Article
1985 Volume 9 Issue 15 Pages
1-5
Published: 1985
Released on J-STAGE: October 02, 2017
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Kiyonori Yoshida
Article type: Article
1985 Volume 9 Issue 15 Pages
7-10
Published: 1985
Released on J-STAGE: October 02, 2017
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This paper argues on computatinal complexity and accuracy to find crossing points of rectilinear figures. It determines necessary and sufficient operations of multiplication for computing a 2-vector which appears frequently in dealing with rectilinear figures. Next, it estimates the necessary computational accuracy to find crossing points of rectilinear figures by assuming that data is given in fixed decimal form.
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Kaora WAKABAYASHI, Hisashi KAWANISHI
Article type: Article
1985 Volume 9 Issue 15 Pages
11-16
Published: 1985
Released on J-STAGE: October 02, 2017
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Thin line preservation method (TP method) is considered to be one of the best picture size conversion method for binary pictures with respect to the converted picture quality. This report describes the results of the subjective assessment experiment of converted picture quality, and clarifies the effective magnification range of the TP method. Furthermore, it is shown that the quality of the repeated TP method which processes the TP method twice is more exellent in the case that conversion ratios are less than 1/2.
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SUMIO YANO, ICHIRO YUYAMA
Article type: Article
1985 Volume 9 Issue 15 Pages
17-22
Published: 1985
Released on J-STAGE: October 02, 2017
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The CCIR Recommendation has already been adopted on the digital television studio standard. This paper describes the results of subjective assessment tests of picture-quality for other members of the family below 4 : 2 : 2,including the effects of line- and field-offset subnyquist-sampling. Consequently, 2 : 1 : 1FO (Field-Offset subnyquist sampling) is superior to other members of the family below 4 : 2 : 2 for stationary pictures, and maintains good picture-quality for moving pictures.
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Makoto Miyahara
Article type: Article
1985 Volume 9 Issue 15 Pages
23-28
Published: 1985
Released on J-STAGE: October 02, 2017
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Two problems are considered ; What kinds of assessment words are adequate to evaluate HDTV pictures? What kinds of physical factors and characteristics are important to obtain a good picture quality? In the Monitor Image System, the perceptual properties should not be used positively. On the contrary, in the entertainment system, the perceptual properties can be used positively. Some kinds of settled convictions on picture coding are wrong in HDTV. The assessment word : natural, smooth, continuous, and stable are important in Entertainment HDTV.
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Yasuhiro Yoshida, Makoto Miyahara
Article type: Article
1985 Volume 9 Issue 15 Pages
29-34
Published: 1985
Released on J-STAGE: October 02, 2017
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Yoshiyuki YASHIMA, Katsutoshi SAWADA
Article type: Article
1985 Volume 9 Issue 15 Pages
35-40
Published: 1985
Released on J-STAGE: October 02, 2017
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An adaptive intraframe/interframe coding method by using extrapolative and interpolative prediction is proposed for HDTV signals. This method adaptively employs previous frame prediction in still areas, and intraframe prediction in moving areas. Input pixels are first separated into two groups where pixels in each group are arranged quincuncially. For intraframe coding, extrapolative prediction is employed for one group, and interpolative prediction for the other. This method is suitable for the high speed processing required for encoding HDTV signals. Computer simulation experiments are carried out to investigate prediction efficiency, SN ratio, and picture quality.
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Koichi TAKIGUCHI
Article type: Article
1985 Volume 9 Issue 15 Pages
41-45
Published: 1985
Released on J-STAGE: October 02, 2017
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This paper briefly introduces 6 papers concerning basic technologies of hardcopy and photoprinter technologies announced at the Second NIP Symposium.
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Kiyohiko Tanno
Article type: Article
1985 Volume 9 Issue 15 Pages
47-52
Published: 1985
Released on J-STAGE: October 02, 2017
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Michihisa Suga
Article type: Article
1985 Volume 9 Issue 15 Pages
53-58
Published: 1985
Released on J-STAGE: October 02, 2017
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Yuji TAKASHIMA
Article type: Article
1985 Volume 9 Issue 15 Pages
59-63
Published: 1985
Released on J-STAGE: October 02, 2017
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Kazuyoshi TATEISHI, Ichimatsu ABIKO
Article type: Article
1985 Volume 9 Issue 15 Pages
65-70
Published: 1985
Released on J-STAGE: October 02, 2017
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Output power variation of LEDs is one of the serious problems for electrophotographic printing. This paper proposes a compensation method of controlling each driving pulse width to make the printed dot size uniform. The theoretical analysis being also pursued, the capability of this method is made clear quantitatively. The effectiveness of this method is experimentally confirmed by printing.
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Kazuyoshi TATEISHI, Ichimatsu ABIKO, Yukio NAKAMURA
Article type: Article
1985 Volume 9 Issue 15 Pages
71-76
Published: 1985
Released on J-STAGE: October 02, 2017
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The LED array has the sufficiant ability to make electrophotgraphic printer because of its high power and high-speed response time. However the LED array has variation in light output power, so light and shade in printing will be notable. In this paper, we proposed Radiation Time Controlling Method for compensation power variation, and explained techniques by simulation and experiment. As the experimental results, the printing quality is affected by the frequency distribution of energy and the concentrated frequency distirbution of energy is good for getting the high printing quality.
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Kunio OHNO, Hiroyuki SUGIYAMA
Article type: Article
1985 Volume 9 Issue 15 Pages
77-82
Published: 1985
Released on J-STAGE: October 02, 2017
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This paper describes the implementation and the evaluation of the five-key mouse with built-in dialog control. The mouse is interfaced to a Symbolics-3600 list machine, using RS-232C, and the implementation of the universal commands is tried on ZMACS editor. Through both results of experiment and the key-stroke level model, the operation time of the five-key mouse is shorter than the three-key mouse. and the effect of the five-key mouse is confirmed.
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Article type: Cover
1985 Volume 9 Issue 15 Pages
Cover2-
Published: 1985
Released on J-STAGE: October 02, 2017
RESEARCH REPORT / TECHNICAL REPORT
FREE ACCESS