ITE Technical Report
Online ISSN : 2424-1970
Print ISSN : 1342-6893
ISSN-L : 1342-6893
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37.37
Displaying 1-14 of 14 articles from this issue
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  • [title in Japanese]
    Article type: Cover
    Pages Cover1-
    Published: August 30, 2013
    Released on J-STAGE: September 21, 2017
    DOIhttps://doi.org/10.11485/itetr.37.37.0_Cover1
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • [title in Japanese]
    Article type: Index
    Pages Toc1-
    Published: August 30, 2013
    Released on J-STAGE: September 21, 2017
    DOIhttps://doi.org/10.11485/itetr.37.37.0_Toc1
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • Large auto-stereoscopic display utilizing polarized light pattern control
    Yoshijiro USHIO, Nobuyuki MIYAKE, Tomohiko YAMAHIRO, Yoshikazu SUGIYAM ...
    Article type: Article
    Session ID: AIT2013-145/3DIT2013
    Published: August 30, 2013
    Released on J-STAGE: September 21, 2017
    DOIhttps://doi.org/10.11485/itetr.37.37.0_1
    CONFERENCE PROCEEDINGS FREE ACCESS
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    An auto-stereoscopic system of large viewing area has been developed by using two FPR (Film Patterned Retarder) -LCD panels as a filter of circler-polarized light and a interlaced image display. Telecentric lights filtered by dot-matrix B/W pixel patterns of FPR-LCD could be focused to each-eye position by not only a lens-array/parallax barrier but also a one-dimensional fresnel lens. Slanted lines of lens or barriers have become invisible by suitable diffuser sheets. As a result, a stereoscopic image of high definition could become shown in a 47' High-vision display.
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  • Floating full color image with computer-generated alcove rainbow hologram
    Ryosuke Wada, Takeshi Yamaguchi, Hiroshi Yoshikawa
    Article type: Article
    Session ID: AIT2013-146/3DIT2013
    Published: August 30, 2013
    Released on J-STAGE: September 21, 2017
    DOIhttps://doi.org/10.11485/itetr.37.37.0_5
    CONFERENCE PROCEEDINGS FREE ACCESS
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    In this paper, we have investigated the floating full color image display with the computer-generated hologram (CGH). The floating image, when utilized as a 3D display, gives strong impression to the viewer. In our previous study, to change the CGH shape from the flat type to the half cylindrical type, the floating image from the output CGH has the nearly 180 degrees viewing angle. However, since the previous CGH does not have wavelength-selectivity, reconstructed image only has a single color. Also, the huge calculation amount of the fringe pattern is big problem. Therefore, we now propose the rainbow-type computer generated alcove hologram. To decrease the calculation amount, the rainbow hologram sacrifices the vertical parallax. Also, this hologram can reconstruct an image with white light. In this study, we introduce the computer-generated rainbow hologram into the floating image display. The rainbow hologram can reconstruct full color image with white light illumination. It can be recorded by using a horizontal slit to limit the vertical parallax. Therefore, the slit changes into the half cylindrical slit, the wide viewing angle floating image display can reconstruct full color image.
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  • Development status of an integrated design system for designers and researchers in computer holography
    Shumpei Murata, Kyoji Matsushima, Sumio Nakahara
    Article type: Article
    Session ID: AIT2013-147/3DIT2013
    Published: August 30, 2013
    Released on J-STAGE: September 21, 2017
    DOIhttps://doi.org/10.11485/itetr.37.37.0_9
    CONFERENCE PROCEEDINGS FREE ACCESS
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    In past several years, "computer holography" that is the technique for creating computer-generated hologram (CGH) is being developed and expected as a new digital art. However, artists or designers who are potential creators of hologram works have the problem of acquiring deep knowledge in optics and programming skills that are required to design 3D scenes and calculate the object field of the scene. To ease this situation, we are developing software system for designing 3D scenes and creating CGH works. This system mainly consists of two tools that are an interactive design tool for designing 3D scenes and a class library which describes the designed 3D scenes as XML and makes it possible to save/load the scene and reuse it in researcher's experimental programs. In this report, we mainly focus on the process to create a real CGH work by using the interactive design tool at current development stage.
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  • A wavefront printer using phase SLM for producing computer-generated volume holograms
    Wataru NISHII, Kyoji MATSUSHIMA
    Article type: Article
    Session ID: AIT2013-148/3DIT2013
    Published: August 30, 2013
    Released on J-STAGE: September 21, 2017
    DOIhttps://doi.org/10.11485/itetr.37.37.0_13
    CONFERENCE PROCEEDINGS FREE ACCESS
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    The wavefront printer is equipment for producing computer-generated holograms (CGH) as volume holograms. This printer records the wavefront generate by spatial light modulator (SLM). We use the phase-only SLM to generate the wavefront because of its wide space-band product. However, the phase-only SLM causes a problem of degradation of reconstructed images because of coding noise due to phase only modulation. This paper describes a technique to make complex amplitude modulation by using a phase-only SLM and ease the coding noise.
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  • Study on Viewing-Zone Enlargement for Tiled Electronic Holography System : For Large-Size and Wide-Viewing-Zone Electronic Holography System
    Takanori SENOH, Koki WAKUNAMI, Yasuyuki ICHIHASHI, Hisayuki SASAKI, Ke ...
    Article type: Article
    Session ID: AIT2013-149/3DIT2013
    Published: August 30, 2013
    Released on J-STAGE: September 21, 2017
    DOIhttps://doi.org/10.11485/itetr.37.37.0_17
    CONFERENCE PROCEEDINGS FREE ACCESS
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    Large size electronic holography reconstruction systems was reported. In this paper, an experimental result is reported for enlarging the viewing-zone angle by inserting multiple spot light sources in such reconstruction optical system.
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  • Hologram binarization method using error diffusion for horizontally scanning holography
    Yuji MATSUMOTO, Yasuhiro TAKAKI
    Article type: Article
    Session ID: AIT2013-150/3DIT2013
    Published: August 30, 2013
    Released on J-STAGE: September 21, 2017
    DOIhttps://doi.org/10.11485/itetr.37.37.0_21
    CONFERENCE PROCEEDINGS FREE ACCESS
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    We previously proposed the horizontally scanning holography that can enlarge both the screen size and the viewing zone angle. The horizontally scanning holography displays several elementary holograms by a MEMS high-speed SLM and a horizontal scanner to provide a small pixel pitch and a high resolution. The horizontally scanning holography needs to binarize the hologram patterns, because high-speed SLMs tend to be able to display only low-bit resolution grayscale images, so that image degradation occurs in reconstructed images. The method of improvement of the grayscale representation of the reconstructed images was previously proposed, which used several threshold levels and a laser modulation. In this study, we use the error diffusion technique to determine the binary hologram patterns. The error diffusion technique is simple and requires only one threshold.
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  • Improvements of computer-generated holographic stereogram based on multi-view display
    Kyohei IKEDA, Yasuhiro TAKAKI
    Article type: Article
    Session ID: AIT2013-151/3DIT2013
    Published: August 30, 2013
    Released on J-STAGE: September 21, 2017
    DOIhttps://doi.org/10.11485/itetr.37.37.0_25
    CONFERENCE PROCEEDINGS FREE ACCESS
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    We improve the simple generation technique for computer-generated holographic stereograms that we proposed previously, which generates the holographic stereograms from multi-view images without diffraction calculation. In this study, a spherical lens is introduced on the hologram display plane. The wavefront is calculate, whose amplitude distribution is the squared root of the parallax image and phase distribution is the phase of the inclined plane wave which proceeds to the corresponding viewpoint. Wavefronts calculated for all parallax images are summed to obtain an object wave. Moreover, the space bandwidths of the wavefronts are limited to reduce speckles in reconstructed images.
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  • Space-bandwidth extension methods in parallel phase-shifting digital holography using a commercially available polarization-imaging camera
    Tatsuki Tahara, Yasunori Ito, Peng Xia, Yuki Shimozato, Yasuhiro Awats ...
    Article type: Article
    Session ID: AIT2013-152/3DIT2013
    Published: August 30, 2013
    Released on J-STAGE: September 21, 2017
    DOIhttps://doi.org/10.11485/itetr.37.37.0_29
    CONFERENCE PROCEEDINGS FREE ACCESS
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    We present methods for extending the space bandwidth available for recording an object wave in the case where a commercially available polarization-imaging camera is used for recording a hologram required for parallel phase-shifting digital holography. Parallel phase-shifting digital holography has been proposed for achieving single-shot wide-bandwidth three-dimensional imaging and can be implemented by using the polarimetric camera having four polarization-detection channels. However, when such the camera is used, most of the space bandwidth is discarded and then both the field of view and resolution are decreased. In this presentation, an optical implementation and image-reconstruction algorithm for extending the bandwidth are proposed and then these methods and previously proposed techniques are comparatively evaluated.
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  • Digital holography utilizing the periodicity of a digital signal : Interests due to the introduction of aliasing to the recorded hologram
    Tatsuki Tahara, Yasuhiko Arai
    Article type: Article
    Session ID: AIT2013-153/3DIT2013
    Published: August 30, 2013
    Released on J-STAGE: September 21, 2017
    DOIhttps://doi.org/10.11485/itetr.37.37.0_33
    CONFERENCE PROCEEDINGS FREE ACCESS
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    A digital holographic technique utilizing the periodicity of a digital signal to extend the space-bandwidth available for recording an object wave is presented. In this technique, the extension is achieved by intentionally setting the aliasing that is caused by the large angle between the optical axes of the reference and object waves, and by using the periodicity of a digital signal, based on an off-axis configuration. Interests due to the aliasing are discussed from the viewpoints of the space bandwidth and the decrease of the visibility of fine interference fringes.
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  • [title in Japanese]
    Article type: Appendix
    Pages App1-
    Published: August 30, 2013
    Released on J-STAGE: September 21, 2017
    DOIhttps://doi.org/10.11485/itetr.37.37.0_App1
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • [title in Japanese]
    Article type: Appendix
    Pages App2-
    Published: August 30, 2013
    Released on J-STAGE: September 21, 2017
    DOIhttps://doi.org/10.11485/itetr.37.37.0_App2
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • [title in Japanese]
    Article type: Appendix
    Pages App3-
    Published: August 30, 2013
    Released on J-STAGE: September 21, 2017
    DOIhttps://doi.org/10.11485/itetr.37.37.0_App3
    CONFERENCE PROCEEDINGS FREE ACCESS
    Download PDF (80K)
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