ITE Technical Report
Online ISSN : 2424-1970
Print ISSN : 1342-6893
ISSN-L : 1342-6893
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34.36
Displaying 1-14 of 14 articles from this issue
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  • [title in Japanese]
    Article type: Cover
    Pages Cover1-
    Published: September 03, 2010
    Released on J-STAGE: September 21, 2017
    DOIhttps://doi.org/10.11485/itetr.34.36.0_Cover1
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • [title in Japanese]
    Article type: Index
    Pages Toc1-
    Published: September 03, 2010
    Released on J-STAGE: September 21, 2017
    DOIhttps://doi.org/10.11485/itetr.34.36.0_Toc1
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • Computer generated hologram using planer patch and approximate Fresnel integral
    Tomoyoshi Shimobaba, Nobuyuki Masuda, Tomoyoshi Ito
    Article type: Article
    Session ID: AIT2010-108/3DIT2010
    Published: September 03, 2010
    Released on J-STAGE: September 21, 2017
    DOIhttps://doi.org/10.11485/itetr.34.36.0_1
    CONFERENCE PROCEEDINGS FREE ACCESS
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    We describe a calculation method of computer-generated-hologram (CGH) using approximate Fresnel integral. The method can generate a CGH from a 3D object composed of polygons to express the polygons as many planer patches. Propagation of the planer patches to a CGH is calculated by approximate Fresnel integral.
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  • Computer-generated holograms of real objects captured by using synthetic-aperture digital holography
    Yasuaki ARIMA, Kyoji MATSUSHIMA, Sumio NAKAHARA
    Article type: Article
    Session ID: AIT2010-109/3DIT2010
    Published: September 03, 2010
    Released on J-STAGE: September 21, 2017
    DOIhttps://doi.org/10.11485/itetr.34.36.0_5
    CONFERENCE PROCEEDINGS FREE ACCESS
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    The wave field of real objects can be recorded by using digital holography. However, the resolution of common image sensors is too low to reconstruct the captured object field by high-definition CGHs, because both the pixel pitch and the number of pixels are insufficient for optical reconstruction by such high quality CGHs. Therefore, the technique of phase-shifting lensless synthetic-aperture digital holography is used for capturing the object field. The captured field is binary-encoded after the numerical interference and then reconstructed as the amplitude hologram in high resolution.
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  • Creation of a high-definition CGH reconstructing mountain scenery
    Kentaro HIGASHI, Hirohito NISHI, Kyoji MATSUSHIMA, Sumio NAKAHARA
    Article type: Article
    Session ID: AIT2010-110/3DIT2010
    Published: September 03, 2010
    Released on J-STAGE: September 21, 2017
    DOIhttps://doi.org/10.11485/itetr.34.36.0_9
    CONFERENCE PROCEEDINGS FREE ACCESS
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    High-definition CGH, created by the polygon-based method, features the reconstruction of spatial 3D images accompanied with a strong sensation of depth because of light-shielding by the Silhouette method. However, hidden-surface removal by the Silhouette method is not easy in self-occluded and uninterrupted large objects such as landscapes like a miniature garden. In this study, a CGH that reconstructs the mountains scenery is created by splitting the mesh data of the scenery generated by Terragen that is a software for generating the 3D scene of a landscape.
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  • Improvement of viewing angle of reconstructed real image from half cylindrical CGH
    Hiroyuki OZAWA, Takeshi YAMAGUCHI, Hiroshi YOSHIKAWA
    Article type: Article
    Session ID: AIT2010-111/3DIT2010
    Published: September 03, 2010
    Released on J-STAGE: September 21, 2017
    DOIhttps://doi.org/10.11485/itetr.34.36.0_13
    CONFERENCE PROCEEDINGS FREE ACCESS
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    In our previous research, we have investigated the real image reconstruction from a flat computer-generated hologram (CGH). The real image CGH offers 3D real images that project to the observer's, fingertips. However, since a flat real image CGH requires the high spatial frequency, the real image CGH usually does not offer the enough viewing angle and the size of the reconstructed images as the practical display. It is necessary for the practical display to expand viewing angle. The alcove hologram was reported as the real image display and the wide viewing angle display. The alcove hologram offers real images with an angle of view of nearly 180 degrees by transforming the shape to half cylindrical. However, the alcove hologram does not have the vertical parallax. In this report, we manufactured the half cylindrical CGH like the alcove hologram. Therefore, the half cylindrical CGH provides the real image with wide viewing angle. Furthermore, the half cylindrical CGH has the vertical parallax and reconstructs the virtual objects. In addition, we manufactured the device to reconstruct real image from the half cylindrical CGH.
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  • Development of Tangible Learning for Holography with Augmented Reality Technology
    Masashi SHIBATA, Takeshi YAMAGUCHI, Hiroshi YOSHIKAWA
    Article type: Article
    Session ID: AIT2010-112/3DIT2010
    Published: September 03, 2010
    Released on J-STAGE: September 21, 2017
    DOIhttps://doi.org/10.11485/itetr.34.36.0_17
    CONFERENCE PROCEEDINGS FREE ACCESS
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    When shooting a hologram, it is necessary to build the optical system in the darkroom with careful handling. Also, it is difficult to teach the setup of the optical system to the beginner in the darkroom. For the beginner, the training material which can be used anytime, anywhere is required. In our previous study, we have proposed the training tool named "Holographer Trainer". By using the Augmented Reality, Holographer Trainer can simulate the setup of the optical system for the hologram. However, the previous system only considered the fixed order of the optical elements. Therefore, the optical path which the laser beam was radiated was not simulated accurately. In this study, to get the positional information of the marker, we accurately calculated the optical path of laser beam. As a result, new application is able to judge whether the arranged optical setup can record the hologram. Also, to enhance the learning effect, new application simulates the effect of the light by several optical elements.
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  • 2D/3D conversion software using OpenCV library
    Kenji YAMAMOTO, Takanori SENOH, Taiichiro KURITA
    Article type: Article
    Session ID: AIT2010-113/3DIT2010
    Published: September 03, 2010
    Released on J-STAGE: September 21, 2017
    DOIhttps://doi.org/10.11485/itetr.34.36.0_21
    CONFERENCE PROCEEDINGS FREE ACCESS
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    Stereoscopic 3D display is gradually becoming popular recently. Under this background, the technology called 2D/3D conversion has been developed, which converts 2D contents to 3D contents for such displays. We introduce our developed software for 2D/3D conversion in this paper. It is useful not only to convert 2D contents but also to develop algorithms for the conversion.
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  • Consideration about wireless transmission and image reconstruction of computer generated hologram using LED
    Masataka Tozuka, Koki Sato, Kunihiko Takano, Makoto Ohki
    Article type: Article
    Session ID: AIT2010-114/3DIT2010
    Published: September 03, 2010
    Released on J-STAGE: September 21, 2017
    DOIhttps://doi.org/10.11485/itetr.34.36.0_25
    CONFERENCE PROCEEDINGS FREE ACCESS
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    It reviews the system which transmits the hologram data which was synthesized with the computer in the space with the white LED and does an image reconstruction. Already low-speed SSTV The result of the image reconstruction of the CGH data in the two dimensions which were transmitted using the method of it is reported on. It is proceeding with transmission and an image reconstruction experiment using the white LED to transmit the higher-precision three-dimensional hologram data at high speed and to do an image reconstruction and this time, it reports them on those results and the reviewing.
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  • 3D measurement of micro-flow via digital holographic particle tracking velocimetry
    Shin-ichi SATAKE
    Article type: Article
    Session ID: AIT2010-115/3DIT2010
    Published: September 03, 2010
    Released on J-STAGE: September 21, 2017
    DOIhttps://doi.org/10.11485/itetr.34.36.0_29
    CONFERENCE PROCEEDINGS FREE ACCESS
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    A micro-digital-holographic particle-tracking velocimetry (micro-DHPTV) method for high time-resolution flow field measurement in a micro-channel is developed. The system consists of an objective lens, a high-speed camera and a single high-frequency double pulsed laser. Particle positions in a three-dimensional field can be reconstructed by a digital hologram. The time evolution of a three-dimensional water flow in a semicircular micro-channel of 100-micro meter width and 40-micro meter depth is obtained successfully using this micro-DHPTV system. Consequently, 130 velocity vectors in the semicircular micro-channel can be obtained instantaneously. We show the visualization measurement obtained by the system; micro-channel, micro-pipe, and micro-channel with Y-junction.
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  • Parallel phase-sifting digital holography using high-speed camera
    Takashi KAKUE, Kenichi ITO, Tatsuki TAHARA, Yuki SHIMOZATO, Yasuhiro A ...
    Article type: Article
    Session ID: AIT2010-116/3DIT2010
    Published: September 03, 2010
    Released on J-STAGE: September 21, 2017
    DOIhttps://doi.org/10.11485/itetr.34.36.0_33
    CONFERENCE PROCEEDINGS FREE ACCESS
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    We demonstrated a parallel phase-shifting digital holography using a high-speed camera as a technique capable of three-dimensional image capturing and measurement for fast moving objects. The camera has polarizer function, and each pixel of the camera can select linear polarization of each direction individually. We constructed the experimental system consisting of a quarter-wave plate and the high-speed camera. Two elastic bands which vertically vibrated were used as fast moving objects. The system first succeeded in parallel phase-shifting digital holography and three-dimensional imaging of dynamically fast moving objects at the speed of 180,000 frames/s for the image consisting of 128×128 pixels. The achieved frame rate is the fastest among the phase-shifting interferometry which have been ever reported, to our best knowledge.
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  • [title in Japanese]
    Article type: Appendix
    Pages App1-
    Published: September 03, 2010
    Released on J-STAGE: September 21, 2017
    DOIhttps://doi.org/10.11485/itetr.34.36.0_App1
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • [title in Japanese]
    Article type: Appendix
    Pages App2-
    Published: September 03, 2010
    Released on J-STAGE: September 21, 2017
    DOIhttps://doi.org/10.11485/itetr.34.36.0_App2
    CONFERENCE PROCEEDINGS FREE ACCESS
    Download PDF (93K)
  • [title in Japanese]
    Article type: Appendix
    Pages App3-
    Published: September 03, 2010
    Released on J-STAGE: September 21, 2017
    DOIhttps://doi.org/10.11485/itetr.34.36.0_App3
    CONFERENCE PROCEEDINGS FREE ACCESS
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