ITE Technical Report
Online ISSN : 2424-1970
Print ISSN : 1342-6893
ISSN-L : 1342-6893
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25.60
Displaying 1-10 of 10 articles from this issue
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  • [title in Japanese]
    Article type: Cover
    Pages Cover1-
    Published: September 17, 2001
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.25.60.0_Cover1
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • [title in Japanese]
    Article type: Index
    Pages Toc1-
    Published: September 17, 2001
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.25.60.0_Toc1
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • Three dimmentional display and hyper reality
    Kenji SUSAMI, Toyohiko HATADA
    Article type: Article
    Session ID: IDY2001-124/HIR2001-
    Published: September 17, 2001
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.25.60.0_1
    CONFERENCE PROCEEDINGS FREE ACCESS
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    Recently, various hyper realistic displays have been developed, thus giving the impression that non-realistic problem of displays will eventually be solved. However, a new problem has now arisen. This paper considers the characteristics of hyper realistic displays, especially 3D display. Specifically, the following items are discussed. a)The relationship between hyper realistic displays and the viewing angle-resolution of vision. b)The unnaturalness(distortion of space perception, such as the cardboard effect, the lack of motion parallax, and so on.)of conventional stereoscopic displays. c)The relationship with visual fatigue. d)The characteristics of image operation to display images.
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  • 8-Milion Pixels Ultra High Definition Images System
    Kenji TANAKA, Kenji SUZUKI, Yasunari SUZUKI, Mitsuo ISOGAI, Yoshiki AR ...
    Article type: Article
    Session ID: IDY2001-125/HIR2001-
    Published: September 17, 2001
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.25.60.0_7
    CONFERENCE PROCEEDINGS FREE ACCESS
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    Communications Research Laboratory(CRL)and Victor Company of Japan, Ltd.(JVC)are now researching and developing a transmission system of ultra high-definition images, which captures, displays and transmits images of higher resolution compared with HDTV, jointly. This paper describes about WHD system, which provides double the resolution of HDTV image, and QHD system, which provides quadruple, for respectively.
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  • High Bit Depth LCD Imaging System
    Yasuhiro Yoshida, Yoichi Yamamoto
    Article type: Article
    Session ID: IDY2001-126/HIR2001-
    Published: September 17, 2001
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.25.60.0_13
    CONFERENCE PROCEEDINGS FREE ACCESS
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    In connection with the property of the human visual system, we have explored a contour artifact in high bit depth TFT-LCD imaging system which has R:G:B=10:10:10bits in tone scale reproduction ability. It has been widely accepted that R:G:B=8:8:8bits in tone scale can cover most high quality application of displays. However it was pointed out a couple of years ago that R:G:B=10:12:9bits in tone scale is require to achieve reality-reproduction by the display. In this report, comparing conventional R:G:B=8:8:8bits system, we discuss visibility of contour artifact based on our R:G:B=10:10:10bits LCD system developed. In our experiment, the system has good ability in tone scale reproduction, and thus improved contour artifacts visibility, though there still be small amount of contour artifact observed even in 10 bits system. This visibility of the contour artifact must relate to the properties of the human visual system such as special frequency response, contrast sensitivity property and light adaptation property. At least these three property of the human visual system have to be discussed to determine what high picture quality display system is.
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  • Proposal of an Evaluation Method of Overall Picture Quality for Displays
    Yohei HANAJIMA, Yoshifumi SHIMODAIRA, Gosuke OHASHI
    Article type: Article
    Session ID: IDY2001-127/HIR2001-
    Published: September 17, 2001
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.25.60.0_19
    CONFERENCE PROCEEDINGS FREE ACCESS
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    There are some types of image displays based on different light emissive principle, recently. In the present study, an evaluation method of overall picture quality are proposed for many of the image displays. The evaluation method takes gamma, maximum luminance, minimum luminance and color reproduction into consideration. Even though, the evaluation method proposed by the previous study didn't consider mutual dependence of effects of factors on picture quality, the evaluation method gives a way of integration of those factors. The way of integration is that the most effective factor among those becomes a representative of them. The overall picture quality estimated by the proposed evaluation method is in good agreement with that evaluated by the direct subjective measurement.
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  • Effects of pixel density, character format, and character size on subjective readability of liquid crystal displays
    Satoru Kubota
    Article type: Article
    Session ID: IDY2001-128/HIR2001-
    Published: September 17, 2001
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.25.60.0_25
    CONFERENCE PROCEEDINGS FREE ACCESS
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    We investigate the effects of pixel density, character format, and character size on subjective readability of liquid crystal displays(LCDs)for personal digital assistants. At 30 cm viewing distance, fifty subjects assessed the readability of 33 different display conditions which were displayed on photographic films that simulated LCDs. The results indicate that the character format for Japanese characters should be more than 10 x 10 pixels as the size of characters was smaller than 2.7 mm. For the characters of 2.7 to 3.5 mm, the preferred character format was 15 x 15 or 17 x 17. The preferred character format depends on pixel density, character size and stroke width. The preferred stroke width for Japanese characters was 200 to 300 μ. The relationships between character size and pixel density to obtain the satisfactory readability were discussed. From readability point of view, the pixel density of displays will be improved up to 250 or 300 pixel-per-inch.
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  • A New Noise Evaluation Method Using Cooperative Human Vision Model and Its Application to Performance Evaluation for Digital Copier
    Masahiro Tomita, Toshikazu Matsui
    Article type: Article
    Session ID: IDY2001-129/HIR2001-
    Published: September 17, 2001
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.25.60.0_31
    CONFERENCE PROCEEDINGS FREE ACCESS
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    A new objective image quality evaluation method for noise has been developed based on a pertinent application of a cooperative human vision model which can simulate accommodative responses and various kinds of perceptual responses theoretically. In order to examine the effectiveness of the proposed evaluation method, it is applied to noise evaluation for patch images output from a digital copier. The following results are obtained:(1)the cooperative model can theoretically predict how the human vision system responds to the patch images' noise, i.e., actual appearance characteristics;(2)the proposed method's quantitative noise evaluation results for the patch images agree well with subjective judgments. These results suggest that the evaluation method is effective as a noise metric based on responses in the human vision system, and moreover, that the cooperative model is valid as a mathematical model of the human vision system.
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  • Cooperative Characteristics between Accommodation Mechanism and Motion Detection Mechanism to Multiple Apparent Motion Stimuli
    Kazuhiro Tsutsumi, Tadanori Sakaguchi, Toshikazu Matsui
    Article type: Article
    Session ID: IDY2001-130/HIR2001-
    Published: September 17, 2001
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.25.60.0_37
    CONFERENCE PROCEEDINGS FREE ACCESS
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    Some experiments suggested the existence of a cooperation between the accommodation and motion detection mechanisms and an importance of the cooperation in explaining motion perception phenomena. In this report, the universality of the existence is clarified by examining the correspondence between motion appearances and accommodative responses to multiple apparent motion stimuli, and the importance of the cooperation is proved by proposing an interpretation method for motion capture and motion transparency. The stimuli consist of two kinds of sine-waves abruptly shifted in opposite directions. Accommodative responses are measured using an infrared optometer while observers are paying attention to each component motion. Consequently, it was clarified again that there exists a cooperation between the accommodation and motion detection mechanisms. Moreover, motion capture and motion transparency could be explained based on a serial multichannel structure generated by the image observing mechanism and based on a parallel operation between the serial multichannel structure and the peripheral vision system, respectively.
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  • [title in Japanese]
    Article type: Appendix
    Pages App1-
    Published: September 17, 2001
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.25.60.0_App1
    CONFERENCE PROCEEDINGS FREE ACCESS
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