ITE Technical Report
Online ISSN : 2424-1970
Print ISSN : 1342-6893
ISSN-L : 1342-6893
27.23
Displaying 1-15 of 15 articles from this issue
  • Article type: Cover
    Pages Cover1-
    Published: March 20, 2003
    Released on J-STAGE: September 20, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    Download PDF (12K)
  • Article type: Index
    Pages Toc1-
    Published: March 20, 2003
    Released on J-STAGE: September 20, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    Download PDF (46K)
  • Tadamasa SAWADA, Hirohiko KANEKO, Kazumichi MATSUMIYA
    Article type: Article
    Session ID: HIR2003-85
    Published: March 20, 2003
    Released on J-STAGE: September 20, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    We can perceive shape from images with shading that is a two-dimensional luminance distribution. However it is physically impossible to reconstruct a unique shape from an image with shading. To resolve this ambiguity for perceiving shape from shading, it has been claimed that we use some assumptions, such as "light from above assumption", "single light source constraint" and so on, and cues such as cast-shadow. These assumptions and cues could be inconsistent with each other and the outcome of such a situation is not known. In this research, we investigated how these assumptions and cues work and are integrated for perceiving shape from shading.
    Download PDF (468K)
  • Takuya Monma, Ko Sakai
    Article type: Article
    Session ID: HIR2003-86
    Published: March 20, 2003
    Released on J-STAGE: September 20, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    We investigate the perception of three-dimensional structure from shading when surface texture is given, specifically to reveal the interaction of shape-from-shading and contour/boundary that segregates figure and ground. The stimuli we utilized consist of circular regions (figure) with simple gradation, superimposed with white-noise (WN) or random-dot (Rnd) texture. We carried out psychophysical experiments using the stimuli and obtained the following results: (1) the 3D perception is improved when the mean illuminance of figure and ground is identical, (2) the perception is improved when WN is superimposed to figure that is darker than ground, (4) the perception is improved if figure's contour is drawn with a darker line when figure is brighter than ground. These results suggest that the discrimination of figure from ground is crucial for the perception of shape-from-shading.
    Download PDF (510K)
  • Haruki MIZUSHINA, Keiji UCHIKAWA, Kenji YOKOI
    Article type: Article
    Session ID: HIR2003-87
    Published: March 20, 2003
    Released on J-STAGE: September 20, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    Retinal image is displaced by saccade, but we do not perceive any displacement of the world across saccade. The visual system must separate the retinal image displacement caused by saccade and that by actual stimulus displacement. A surrounding stimulus that covered a whole visual field would become a basis of the separation of the retinal image displacement across saccade. We investigated how a displacement perception of a test stimulus was influenced by a displacement of a surrounding stimulus. The point of subjective equality (PSE) for the perceived direction of the test displacement shifted to same direction of displacement of the surrounding stimulus.
    Download PDF (642K)
  • Kentaro SAKURAI, Satoshi SHIOIRI, Hirohisa YAGUCHI
    Article type: Article
    Session ID: HIR2003-88
    Published: March 20, 2003
    Released on J-STAGE: September 20, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    We measured velocity thresholds for relative and uniform motion in two conditions, dichoptic and binocular presentation to investigate motion process level. In the first experiment, we measured velocity threshold as a function of spatial frequency and as a function of contrast in the second experiment. The results showed that the sensitivity for relative motion changed depending on the way of stimulus presentation. The sensitivity is high compared to uniform motion when viewed binocularly, but there is almost no difference between relative and uniform motion when viewed dichoptically. This suggests that the process of relative motion occurs before binocular integration.
    Download PDF (527K)
  • Takeshi HAMANO, Yuichiro KUME, Junji SONE
    Article type: Article
    Session ID: HIR2003-89
    Published: March 20, 2003
    Released on J-STAGE: September 20, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    Video games are widely accepted as an amusement system in daily life. However, it is difficult for the visually handicapped to enjoy them since visual information can not be perceived. In this study, an electronic game system using vibrators is proposed to transmit visual information through tactile sensation. One-dimensional phantom sensation was employed. Stimulation method and perceptual properties of phantom sensation were psychophysically investigated. Using the obtained data, a shooting game was prototyped and its performance was evaluated.
    Download PDF (513K)
  • Hiroshi Usuda, Masanori Idesawa
    Article type: Article
    Session ID: HIR2003-90
    Published: March 20, 2003
    Released on J-STAGE: September 20, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    When man uses information systems, it is necessary to input the purpose and intention to information systems exactly. On the other hand, information systems need to guess man's purpose and an intention, and to perform the operation and processing according to it, and need to present the result to man with the form that is easier to understand. As the flexible and smooth communication method between man and information systems, we propose a paper interface using figure codes for information systems in this thesis.
    Download PDF (640K)
  • Keisuke INOUE, Kazuhiro SHIMONOMURA, Seiji KAMEDA, Tetsuya YAGI
    Article type: Article
    Session ID: HIR2003-91
    Published: March 20, 2003
    Released on J-STAGE: September 20, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    We have designed a real time vision system using a neuromophic silicon retina and FPGA. Using the system, target tracking was carried out in indoor illumination. In the tracking operation, the silicon retina extracted a moving object from background objects by subtracting consecutive image frames after smoothing. Then, the image of the extracted object was binarized and a center of the object was found as the median with FPGA circuits. The system was able to execute robust image processing under indoor illumination with a compact hardware and a low power consumption. Therefore, it is considered to be suitable for various engineering applications, e.g., robot vision and etc.
    Download PDF (606K)
  • Youichi Horiuchi, Yuichiro Kume, Junji Sone
    Article type: Article
    Session ID: HIR2003-92
    Published: March 20, 2003
    Released on J-STAGE: September 20, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    Feasibility of a free-space 3D display using liquid-gas two phase-flow were studied. Thin/flat smoke (liquid-gas multi-phase) screen was blown out from a narrow slit and mechanically scanned to project 3D video images. In order to maintain the flatness of the screen, a narrow nozzle for smoke flow was sandwitched by two wider nozzles for air flows in order to extend the potential core. The properties of projected images, such as reflection rate and resolution, and deformation of the screen due to mechanical scanning were evaluated. Image data generation and projection were discussed to project real 3D images. As a reault, 3D images were displayed in free-space, although the scan rate was low.
    Download PDF (595K)
  • Mina AOKI, Yuka TAKENAKA, Katsuya NEGISHI, Masahiko FUJITA
    Article type: Article
    Session ID: HIR2003-93
    Published: March 20, 2003
    Released on J-STAGE: September 20, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    Large screen 3D-stereo theater brings us enhancement of reality. However, such a 3-D theater provides us fatigue that we don't experience with 2-D theater. This fatigue is supposed to be caused by the discrepancy between vergence and accommodation. In this paper, we compared both vergences in observing a real object and a 3-D virtual object. The results showed that there are some differences in vergence depending on the method for presentation of 3-D object. The results also showed that in the case of 3-D presentation that was easy to make a binocular fusion was used, the vergences were same as that of in observing real object.
    Download PDF (500K)
  • Atsuo Hanazato, Hirokazu Yamanoue, Yuji Nojiri, Fumio Okano
    Article type: Article
    Session ID: HIR2003-94
    Published: March 20, 2003
    Released on J-STAGE: September 20, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    The impression of the discontinuous change of parallax distribution on the psychological factor for the stereoscopic images has been subjectively evaluated. One psychological factor "ease of viewing" was obtained with the factor analysis. Then we evaluated the stereoscopic images which parallax ware controlled. As a result, especially the change of the distance that causes the convergence change of viewers eyes influences on "ease of viewing".
    Download PDF (464K)
  • Mitsuharu Ogiya, Ko Sakai, Yuzo Hirai
    Article type: Article
    Session ID: HIR2003-95
    Published: March 20, 2003
    Released on J-STAGE: September 20, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    There are two types of binocular disparity, one of which is spatial binocular disparity, and the other is temporal binocular disparity. We carried out psychophysical experiments to investigate depth and motion perception from temporal disparity. We control information available to the visual system by a thin slit. The results indicate that temporal disparity gives correct depth and motion perception in anorthoscopic perception. The amount of absolute depth from temporal disparity is almost identical to that from spatial disparity. The results suggest that the cortical mechanism that processes simultaneously spatial and temporal information; presumably the two are inseparable in the neural system.
    Download PDF (505K)
  • Article type: Appendix
    Pages App1-
    Published: March 20, 2003
    Released on J-STAGE: September 20, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    Download PDF (74K)
  • Article type: Appendix
    Pages App2-
    Published: March 20, 2003
    Released on J-STAGE: September 20, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    Download PDF (74K)
feedback
Top