ITE Technical Report
Online ISSN : 2424-1970
Print ISSN : 1342-6893
ISSN-L : 1342-6893
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32.27
Displaying 1-15 of 15 articles from this issue
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  • [title in Japanese]
    Article type: Cover
    Pages Cover1-
    Published: June 27, 2008
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.32.27.0_Cover1
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • [title in Japanese]
    Article type: Index
    Pages Toc1-
    Published: June 27, 2008
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.32.27.0_Toc1
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • [title in Japanese]
    Article type: Bibliography
    Pages Misc1-
    Published: June 27, 2008
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.32.27.0_Misc1
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • Three-Dimensional Image Reconstruction Using Electronic Holography
    Tomoyuki MISHINA, Makoto OKUI
    Article type: Article
    Session ID: 3DIT2008-38/IDY2008-
    Published: June 27, 2008
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.32.27.0_1
    CONFERENCE PROCEEDINGS FREE ACCESS
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    In this paper on electronic holography, we describe the elimination of the conjugate beams, the enlargement of the viewing zone angle, and the hologram production not depending on laser beam. With an electronic holography system which applies these methods to liquid crystal panels, real, moving objects under natural light are recorded in holograms and the three-dimensional images of their objects are reconstructed with the undesired beams reduced. The reconstructed images can be viewed as autostereoscopic images using both eyes at a distance of 40 cm.
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  • Phantom imaging elimination in Computer Generated Hologram from Image with Depth Map
    Takanori SENOH, Tomoyuki MISHINA, Makoto OKUI
    Article type: Article
    Session ID: 3DIT2008-39/IDY2008-
    Published: June 27, 2008
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.32.27.0_9
    CONFERENCE PROCEEDINGS FREE ACCESS
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    2D images with depth map can generate high-resolution electronic holography with small amount of data for live scene. However, when generating holograms from re-projected depth image in 3D world, rays from background objects may penetrate the fringe area of foreground objects depending on the ray angle, hence cause phantom imaging effect. In this report, an occlusion map, a kind of Z-buffer in CG hidden-surface elimination method, is newly introduced together with a novel map writing order control, avoiding hologram pixel value replacement which might be caused by the foreground objects. An experimental result of phantom imaging elimination based on the proposed occlusion map method is reported.
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  • Assessment of visual accommodation and sensory evaluation under watching 3D moving images
    Kazuhiro FUJIKAKE, Masako OMORI, Satoshi HASEGAWA, Hiroki TAKADA, Tets ...
    Article type: Article
    Session ID: 3DIT2008-41/IDY2008-
    Published: June 27, 2008
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.32.27.0_13
    CONFERENCE PROCEEDINGS FREE ACCESS
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    We measured the visual accommodation during stereoscopic viewing of moving 3-D (three dimensional) virtual images. We also evaluated the subjective sense of the 3-D virtual images. 3-D and 2-D (two dimensional) images were used in the experiment. With the 3-D images, the accommodative focal distance was similar to that for real images. However, a distance was maintained when subjects viewed 2-D images. The subjective evaluation of the display quality for the 3-D image was fairly high. However, the 2-D image was thought to be more natural and comfortable to the visual sense.
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  • On the stabilometry as a method to evaluate motion sickness induced by 3D movie
    Hiroki TAKADA, Kazuhiro FUJIKAKE, Masako OMORI, Satoshi HASEGAWA, Tets ...
    Article type: Article
    Session ID: 3DIT2008-42/IDY2008-
    Published: June 27, 2008
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.32.27.0_17
    CONFERENCE PROCEEDINGS FREE ACCESS
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    Motion sickness caused by watching 3D movies has been measured by psychological and physiological methods. The simulator sickness questionnaire (SSQ) is a well-known former method that is herein used for verifying the occurrence of visually induced motion sickness. We also measure the sway of the center of gravity of the human body before and during exposure to a 3D movie while subjects are instructed to remain in the Romberg posture for the first 60 s and maintain a wide stance (heels midlines 20 cm apart) for the next 60 s. While there are several minimal points of the temporally averaged potential function involved in the mathematical model of the sway, the wide stance reduces the gradient of the potential function.
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  • Ambiguous Rendering for Suppressing Deformation Effect for Stereoscopic Viewing of Spatially Inconsistent Scenes
    Shigeru OWADA, Jun FUJIKI
    Article type: Article
    Session ID: 3DIT2008-43/IDY2008-
    Published: June 27, 2008
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.32.27.0_21
    CONFERENCE PROCEEDINGS FREE ACCESS
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    We report our trial to suppress a deformation effect present when stereoscopically viewing spatially inconsistent scenes: the rendered geometry looks deformed along with the viewpoint change. We deal with the image synthesized by CG, viewed from incorrect viewpoint, as a preliminary study for multiperspective rendering. By applying several rendering styles, for example sketch-like scribbling, dot rendering or special hatching, we distract the observer's attention from the geometric inconsistency. It is our future work to perform a quantitative evaluation of our system.
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  • All-Around Convergent Views Acquisition System using Convex Mirrors
    Gentaro TAKEDA, Tomohiro YENDO, Toshiaki FUJII, Masayuki TANIMOTO
    Article type: Article
    Session ID: 3DIT2008-44/IDY2008-
    Published: June 27, 2008
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.32.27.0_25
    CONFERENCE PROCEEDINGS FREE ACCESS
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    In this paper, we present a new image acquisition system. The proposed system can capture the dynamic scene from all-around views. This system consists of 360 convex-mirrors, a tilted flat spinning mirror, and a high-speed camera. 360 convex-mirrors are put around an object and these form virtual images of it. The size of this system is smaller than that of early system since convex-mirrors form reducing virtual images. High-speed camera can acquire multi viewpoint images by mirror scanning. Here, we simulated this system with ray tracing and confirmed the principle. And we succeed to compensate distortions on these pictures.
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  • Speed-up of a 3D camera system mounted on a linear translation stage by camera parameter estimation
    Yuki KAI, Yasuhiro TAKAKI
    Article type: Article
    Session ID: 3DIT2008-45/IDY2008-
    Published: June 27, 2008
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.32.27.0_29
    CONFERENCE PROCEEDINGS FREE ACCESS
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    We proposed a high-density directional 3D display. Since this 3D display technique requires capturing images at the same pitch of 3D resolvable points, a large number of images should be captured. In this study, we focus on a camera system mounted on a linear translation stage. This system requires considerably long capturing time because the camera stops at each capturing position to adjust the camera position precisely. In the present study, we consider a technique that captures a movie, i.e., a series of images, and estimates camera positions by detecting and matching feature points of images. The SIFT was used for detecting feature points. The RANSAC was used to improve the correspondence of feature points. Then, the camera parameters were estimated considering the perspective projection. As a result, the image capturing time was reduced to 7.9 s to capture 216 images. The previous method required 160.0 s.
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  • 3D Projecter using Non-Polarized Dichroic X-prism : Function and possibility of non-polarized dichroic X-prism
    Kuninori Okuhara
    Article type: Article
    Session ID: 3DIT2008-46/IDY2008-
    Published: June 27, 2008
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.32.27.0_33
    CONFERENCE PROCEEDINGS FREE ACCESS
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    We present a projector using one time-sequential LCOS illuminated by a random polarized RGB-LED using non-polarized dichroic cross prism, a projector using two time-sequential LCOS's, and a stereoscopic projector. We also explain the system structure of a compact projector using three LCOS's illuminated by single polarized and color separated light using a non-polarized cross prism, and the optical system of a stereoscopic projector using six LCOS's.
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  • Fingertip Pointing Using IR Stereo Camera for Mobile HDD Display
    Eisuke TAKAMOTO, Yasuhiro TAKAKI
    Article type: Article
    Session ID: 3DIT2008-47/IDY2008-
    Published: June 27, 2008
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.32.27.0_37
    CONFERENCE PROCEEDINGS FREE ACCESS
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    We proposed the High-Density Directional (HDD) display for 3D display. Mobile HDD display can make high realistic sensation due to stereoscopic display though screen size is small. Anew man-machine interface can be realized using the mobile HDD display and the fingertip pointing. We previously proposed fingertip pointing using ultrasonic sensors. The detection accuracy was low because the ultrasonic wavelength was about 8.5 mm. In this study, we use fingertip pointing using a IR stereo camera to improve the detection accuracy. The fingertip pointing was applied to spatial drawing.
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  • [title in Japanese]
    Article type: Appendix
    Pages App1-
    Published: June 27, 2008
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.32.27.0_App1
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • [title in Japanese]
    Article type: Appendix
    Pages App2-
    Published: June 27, 2008
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.32.27.0_App2
    CONFERENCE PROCEEDINGS FREE ACCESS
    Download PDF (75K)
  • [title in Japanese]
    Article type: Appendix
    Pages App3-
    Published: June 27, 2008
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.32.27.0_App3
    CONFERENCE PROCEEDINGS FREE ACCESS
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