• Title/Summary/Keyword: Tsukuba

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AR based ornament design system for 3D printing

  • Aoki, Hiroshi;Mitanin, Jun;Kanamori, Yoshihiro;Fukui, Yukio
    • Journal of Computational Design and Engineering
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    • v.2 no.1
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    • pp.47-54
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    • 2015

  • In recent years, 3D printers have become popular as a means of outputting geometries designed on CAD or 3D graphics systems. However, the complex user interfaces of standard 3D software can make it difficult for ordinary consumers to design their own objects. Furthermore, models designed on 3D graphics software often have geometrical problems that make them impossible to output on a 3D printer. We propose a novel AR (augmented reality) 3D modeling system with an air-spray like interface. We also propose a new data structure (octet voxel) for representing designed models in such a way that the model is guaranteed to be a complete solid. The target shape is based on a regular polyhedron, and the octet voxel representation is suitable for designing geometrical objects having the same symmetries as the base regular polyhedron. Finally, we conducted a user test and confirmed that users can intuitively design their own ornaments in a short time with a simple user interface.

  • https://doi.org/10.1016/j.jcde.2014.11.005 인용 PDF

MULTI-VIEW STEREO CAMERA CALIBRATION USING LASER TARGETS FOR MEASUREMENT OF LONG OBJECTS

  • Yoshimi, Takashi;Yoshimura, Takaharu;Takase, Ryuichi;Kawai, Yoshihiro;Tomita, Fumiaki
    • Proceedings of the Korean Society of Broadcast Engineers Conference
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    • 2009.01a
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    • pp.566-571
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    • 2009

  • A calibration method for multiple sets of stereo vision cameras is proposed. To measure the three-dimensional shape of a very long object, measuring the object at different viewpoints and registration of the data are necessary. In this study, two lasers beams generate two strings of calibration targets, which form straight lines in the world coordinate system. An evaluation function is defined to calculate the sum of the squares of the distances between each transformed target and the fitted line representing the laser beam to each target, and the distances between points appearing in the data sets of two adjacent viewpoints. The calculation process for the approximation method based on data linearity is presented. The experimental results show the effectiveness of the method.

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Complex Conjugate Resolved Retinal Imaging by One-micrometer Spectral Domain Optical Coherence Tomography Using an Electro-optical Phase Modulator

  • Fabritius, Tapio E.J.;Makita, Shuichi;Yamanari, Masahiro;Myllyla, Risto A.;Yasuno, Yoshiaki
    • Journal of the Optical Society of Korea
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    • v.15 no.2
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    • pp.111-117
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    • 2011

  • Full-range spectral domain optical coherence tomography (SD-OCT) with a 1-${\mu}m$ band light source is shown here. The phase of the reference beam is continuously stepped while the probing beam scans the sample laterally (B-scan). The two dimensional spectral interferogram obtained is processed by a Fourier transform method to obtain a complex spectrum leading to a full-range OCT image. A detailed mathematical explanation of the complex conjugate resolving method utilized is provided. The system's measurement speed was 7.96 kHz, the measured axial resolution was $9.6{\mu}m$ in air and the maximum sensitivity 99.4 dB. To demonstrate the effect of mirror image elimination, In vivo human eye pathology was measured.

  • https://doi.org/10.3807/JOSK.2011.15.2.111 인용 PDF KSCI

22 GHz MONITORING OF SGR A* DURING THE G2 PERI-CENTER PASSING WITH THE JAPANESE VLBI NETWORK

  • KAMEYA, O.;TSUBOI, M.;ASAKI, Y.;YONEKURA, Y.;MIYAMOTO, Y.;KANEKO, H.;SETA, M.;NAKAI, N.;MIYOSHI, M.;TAKABA, H.;WAKAMATSU, K.;FUKUZAKI, Y.;MORIMITSU, T.;SEKIDO, M.
    • Publications of The Korean Astronomical Society
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    • v.30 no.2
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    • pp.649-650
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    • 2015

  • We have been performing daily VLBI monitoring of the flux density of Sagittarius (Sgr) $A^{\ast}$ at 22 GHz from February 2013 to August 2014 using a sub-array of the Japanese VLBI Network (JVN). The purpose of this monitoring is to explore the flux density variability at daily time resolution for a period longer than one year with the G2 cloud approaching. The flux density of Sgr $A^{\ast}$ is basically stable during the observational period, though there are some small variations. The average and scattering range are consistent with the previously observed values. We have observed no strong flare of Sgr $A^{\ast}$ although it is near the expected peri-center passing.

  • https://doi.org/10.5303/PKAS.2015.30.2.649 인용 PDF KSCI