ITE Technical Report
Online ISSN : 2424-1970
Print ISSN : 1342-6893
ISSN-L : 1342-6893
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24.54
Displaying 1-13 of 13 articles from this issue
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  • [title in Japanese]
    Article type: Cover
    Pages Cover1-
    Published: September 22, 2000
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.24.54.0_Cover1
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • [title in Japanese]
    Article type: Index
    Pages Toc1-
    Published: September 22, 2000
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.24.54.0_Toc1
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • Digital Picture and Digital Display
    Tetsuo Mitsuhashi
    Article type: Article
    Session ID: IDY2000-145/HIR2000-
    Published: September 22, 2000
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.24.54.0_1
    CONFERENCE PROCEEDINGS FREE ACCESS
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    A television system is composed by three functional blocks such as input block, signal recording, processing and transmission block and display block. Digital television meant digitalization of signal recording, processing and transmission blocks before. The display with bitplane representation called as digital display is put into markets recently, and the digitalization of the display block is advanced by using the digital display. However, on the picture quality, the digital display seems to have some unique characteristics, which dose not exist in the analog display such as CRT, such as false contour caused by bit plane representation. This report describes about some visual characteristics on television picture quality for examination of high picture quality digital display.
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  • Picture Quality Assessment Technique for Digital Coded Video
    Eisuke NAKASU
    Article type: Article
    Session ID: IDY2000-146/HIR2000-
    Published: September 22, 2000
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.24.54.0_7
    CONFERENCE PROCEEDINGS FREE ACCESS
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    Picture quality assessment technique for digital coded video evokes much interest as digital audio-visual systems are widely being used. Picture quality of digital video should be assessed carefully considering characteristics of distortions caused by digital coding, which appear locally and time varying, are much different from analog systems. This paper describes procedures of subjective picture quality assessment tests and the trend of the new technology of criticality and objective quality assessment of video.
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  • Fundamental Deterioration of Picture Quality for Moving Images Displayed on LCDs and Methods for Improvement
    Taiichiro KURITA
    Article type: Article
    Session ID: IDY2000-147/HIR2000-
    Published: September 22, 2000
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.24.54.0_13
    CONFERENCE PROCEEDINGS FREE ACCESS
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    Degradation of picture quality for moving images displayed on hold type displays such as TFT-LCDs and its improving methods are discussed. When moving images are displayed on TFT-LCD displays, which sustain light intensity in a field period of video signal, the image quality is degraded, or the images are perceived as blurred. The cause of the degradation is the sustained light. So picture quality improvement cannot be attained only by to fasten transient response time of LCDs. The improvement for this fundamental degradation is necessary. Two improving methods are described. Examples of the improvement and an objective measurement method of moving picture quality considering the degradation are introduced.
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  • Subjective Evaluation of Motion Picture Quality on LCDs
    Tohru Tamura, Norihiko Ushida, Iwao Ohishi
    Article type: Article
    Session ID: IDY2000-148/HIR2000-
    Published: September 22, 2000
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.24.54.0_19
    CONFERENCE PROCEEDINGS FREE ACCESS
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    We compared motion picture quality of LCD with that of CRT display. TN, IPS and STN LCD were tested by subjective evaluation. Two moving patterns were tested, one was the white rotating line on the black background and the other was the checker pattern moving horizontally. The results showed that picture quality on the STN display was significantly worse than that on both TN and IPS display, however, there was no significant difference in picture quality between TN and IPS LCD in most test conditions. Comparing to the CRT display, there found significantly lower quality on all three LCDs, especially when the checker patterns moving horizontally.
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  • Color Management of Reflective-type LCD in Terms of Adaptation of the Human Visual System to Light Source Variation
    Yasuhiro Yoshida, Yoichi Yamamoto
    Article type: Article
    Session ID: IDY2000-149/HIR2000-
    Published: September 22, 2000
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.24.54.0_25
    CONFERENCE PROCEEDINGS FREE ACCESS
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    In connection with the color adaptation property of the human visual system, we have explored color management of a reflective-type TFT LCD (R-LCD). Since the R-LCD works together with its ambient light as a light source, it is expected that the colorimetric color on the R-LCD must be changed if the illuminant of the ambient light is changed. However, due to the adaptation property of the human visual system, the eye does not perceive colorimetrically-corrected colors equivalently if they are on the R-LCD. In this paper, we discuss results obtained from subjective experiments, which were initiated in order to understand the perceived color differences according to light source changes. Also we show how these properties of the human visual system can be modeled and calibrated in a color management unit of a personal computer(PC), which is applicable to the R-LCD in practical usage condition.
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  • Effects of age-related changes in vision on reading performance with liquid crystal displays
    Satoru Kubota, Kenji Matsudo
    Article type: Article
    Session ID: IDY2000-150/HIR2000-
    Published: September 22, 2000
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.24.54.0_31
    CONFERENCE PROCEEDINGS FREE ACCESS
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    The effects of display luminance, contrast, and stroke-width of the characters of a LCD on reading rate were measured for groups of young (mean age 21.2 years) and old (mean age 68.6 years) subjects. We also measured the contrast sensitivity, and visual acuity for the two groups. Within the old group, correlations between contrast sensitivity at a high-spatial-frequency and reading rate were significant. The results suggest that contrast sensitivity plays a role in limiting reading speed, then age-related changes in the high-spatial-frequency contrast sensitivity will result in reading deficits. Requirements for the LCDs used for reading by older users were discussed.
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  • Depth Perception Based on Binocular Disparity and 3-D Dispaly : Examples of "Depth-Fused 3-D (DFD) Display" and "Virtual Frame (VFM)"
    Sakuichi Ohtsuka, Shiro Suyama, Hideaki Takada, Yasuo Ishigure
    Article type: Article
    Session ID: IDY2000-151/HIR2000-
    Published: September 22, 2000
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.24.54.0_37
    CONFERENCE PROCEEDINGS FREE ACCESS
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    It is important that we know how the human visual system perceives the real visual world in order to design novel displays. This paper describes (1) some characteristics of human visual system associated with three-dimensional (3-D) perception based on binocular disparity, especially direction, shape and alignment with occulsion, (2) the phenomenon that makes the human observer perceive depth incorrectly when an object occluded by the frame is displayed this side of the display plane and a technique called "virtual frame" that suppresses this phenomena, and (3) a novel method called "depth-fused 3-D display" that enables a human observer to perceive an apparent 3-D image using only two intensity modulated 2-D images at different depths.
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  • Effect of tactile learning on depth cue integration process
    Yuichi Sakano, Hirohiko Kaneko, Keiji Uchikawa
    Article type: Article
    Session ID: IDY2000-152/HIR2000-
    Published: September 22, 2000
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.24.54.0_43
    CONFERENCE PROCEEDINGS FREE ACCESS
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    We investigated whether tactile learning changes the weights of depth cues for the perception of slant. In the tactile learning phase, the tactile information was consistent with either binocular disparity or perspective information. We hypothesized that after the learning phase, the reliability of the cue consistent with the tactile information increase, and then the weight of the cue would increase. During the tactile learning phase, the subjects rotated the real circular paddle with both hands actively, and saw a virtual surface at the corresponding position of the real paddle through a mirror-stereoscope. One of the depth cue for the surface slant, disparity or perspective, was changing to synchronize with the rotation of the real paddle. The results showed that tactile learning can change the weights of depth cues, although the tendencies was inconsistent among the subjects. This suggests that the process of depth cue integration has plasticity.
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  • Cooperative Characteristics between Motion Detection Mechanism and Visual Accommodation Mechanism
    Toshikazu Matsui
    Article type: Article
    Session ID: IDY2000-153/HIR2000-
    Published: September 22, 2000
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.24.54.0_49
    CONFERENCE PROCEEDINGS FREE ACCESS
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    Visual accommodative responses to multiple motion images are measured using an infrared optometer for more subjects than before. The stimuli consist of two or three drifting sinusoidal waves with opposite motion directions. Accommodative responses are measured while each component wave's motion is paid attention to. The following results are obtained: (1)there exist two or three kinds of accommodative states which accompany two or three kinds of motion appearance characteristics depending on which component wave's motion observers pay attention to; (2)the two or three accommodative response values always retain the same relation in their magnitude regardless of viewing distance; (3)the degree of the retinal image's blur becomes larger with a decrease in the spatial frequency of the attention-getting component wave. These results clarify that accommodation for motion images is determined based on the cooperation between the motion detection mechanism and the accommodation mechanism.
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  • [title in Japanese]
    Article type: Appendix
    Pages App1-
    Published: September 22, 2000
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.24.54.0_App1
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • [title in Japanese]
    Article type: Cover
    Pages Cover2-
    Published: September 22, 2000
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.24.54.0_Cover2
    CONFERENCE PROCEEDINGS FREE ACCESS
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