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  1. No Access

    Article

    A fractal-based 2D expansion method for multi-scale volume data visualization

    Visualization of volume data is difficult to realize and control because the most common output device is a two-dimensional (2D) display and the most common input device is a mouse, which only allows 2D operat...

    T. Fujiwara, M. Iwamaru, M. Tange, S. Someya, K. Okamoto in Journal of Visualization (2011)

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    Article

    Study on concurrent measurements of velocity and density distributions for high-speed CO2 flow

    Velocity and density distributions of a high-speed and initial CO2 jet flow have been analyzed concurrently by a developed three-dimensional digital speckle tomography and a particle image velocimetry (PIV). Two ...

    Y. -J. Kim, K. Okamoto, H. S. Ko in Journal of Visualization (2009)

  3. No Access

    Article

    Measurement of two overlapped velocity vector fields in microfluidic devices using time-resolved PIV

    N. Erkan, K. Shinohara, K. Okamoto, T. Okamoto, T. Fujii in Journal of Visualization (2008)

  4. No Access

    Article

    Mixing enhancement in a microfluidic device

    Z. **, S. Someya, K. Okamoto, H. Hu in Journal of Visualization (2008)

  5. No Access

    Article

    X-ray visualization of powder flow in a screw feeder for different shaped screws

    K. Uchida, K. Okamoto in Journal of Visualization (2007)

  6. No Access

    Article

    Measurement of the flow and its vibration in Japanese traditional bamboo flute using the dynamic PIV

    All wind instruments produce sound due to the vibration of air inside of the instrument. In the case of a trumpet or a clarinet, the mouth or a reed helps to generate variable tones. In the case of a flute, th...

    S. Someya, K. Okamoto in Journal of Visualization (2007)

  7. No Access

    Article

    Visual / Visualize / Visualization

    K. Okamoto in Journal of Visualization (2006)

  8. No Access

    Article

    4D-PTV Measurements of an im**ed jet with a dynamic 3D-PTV

    4D-PTV system was constructed. The measurement system consists of three high-speed high-definition cameras (1k × 1k, 2000 fps), Nd-Yag laser (2000 Hz) and a host computer. The GA-3D-PTV algorithm was used for ...

    T. G. Hwang, D. H. Doh, K. Okamoto in Journal of Visualization (2005)

  9. No Access

    Article

    Effect of korteweg stress in miscible liquid two-layer flow in a microfluidic device

    Miscible liquid two-layer flow in a Y-shaped microfluidic device, which consists of microchannels with 120 μm in width and 35 μm in depth, is investigated by particle image velocimetry (PIV) to clarify the flo...

    Y. Sugii, K. Okamoto, A. Hibara, M. Tokeshi, T. Kitamori in Journal of Visualization (2005)

  10. No Access

    Article

    Quantitative visualization of micro-tube flow using micro-PIV

    This paper describes PIV measurements ofthe flow field in a micro round tube with an internal diameter of 100 μm in order to examine micro-scale effects. Since the refractive index of the micro tube almost cor...

    Y. Sugii, K. Okamoto in Journal of Visualization (2004)

  11. No Access

    Article

    Chemically racting liquid round jet

    An experimental study was conducted on a chemically reacting liquid round free jet. The Laser Induced Fluorescence (LIF) technique was adopted to evaluate the mixing both the upstream region near the transitio...

    S. D. Hong, K. Okamoto, H. J. Kim, Y. Sugii, H. Madarame in Journal of Visualization (2003)

  12. No Access

    Article

    3D shape reconstruction from synthetic images captured by a rotating periscope system with a single focal direction

    A three-dimensional shape measurement system with only one camera and a rotating periscope is proposed. Many images are captured at every few degrees of periscope rotation. The distance along the optical axis ...

    S. Someya, K. Okamoto, G. Tanaka in Journal of Visualization (2003)

  13. No Access

    Article

    Preliminary study of two immiscible liquid layers subjected to a horizontal temperature gradient

    Marangoni convection, driven by interfacial instability due to a surface tension gradient, presents a significant problem in the crystal growth process. To achieve better materials processing, it is necessary ...

    S. Someya, T. Munakata, M. Nishio, K. Okamoto in Journal of Visualization (2003)

  14. No Access

    Article

    Comparison of sub-pixel estimation of PIV using frequency response analysis

    The frequency responses on sub-pixel evaluation techniques have been investigated using the Monte-Carlo technique. The frequency response by the FFT based cross-correlation gives very good results although som...

    K. Okamoto in Journal of Visualization (2002)

  15. No Access

    Article

    Visualization study on the layer formation of electro-rheological fluid

    The visualization study on the microstructure of the Electro-Rheological (ER) fluid was carried out. The dense particle motion was difficult to visualize because of the severe light scattering by the particle ...

    K. Okamoto, T. Nakatsukasa, H. Madarame in Journal of Visualization (2001)

  16. No Access

    Article

    Evaluation of the 3D-PIV standard images (PIV-STD project)

    Particle Imaging Velocimetry (PIV) offers many advantages for studies of fluid flows. Lots of PIV techniques have been developed and applied to various flow fields. However, there are no standard tools for eva...

    K. Okamoto, S. Nishio, T. Kobayashi, T. Saga, K. Takehara in Journal of Visualization (2000)

  17. No Access

    Article

    A comparative study of the PIV and LDV measurements on a self-induced sloshing flow

    Particle Imaging Velocimetry (PIV) and Laser Doppler Velocimetry (LDV) measurements on a self-induced sloshing flow in a rectangular tank had been conducted in the present study. The PIV measurement result was...

    T. Saga, H. Hu, T. Kobayashi, S. Murata, K. Okamoto, S. Nishio in Journal of Visualization (2000)

  18. No Access

    Article

    Three-dimensional particle cluster tracking algorithm using affine transformation

    In Particle Image Velocimetry (PIV), the cross correlation tracking technique is widely used to analyze the particle images. The technique assumes that the fluid motion, within small regions of the flow field,...

    K. Okamoto in Journal of Visualization (1998)

  19. No Access

    Article

    Evaluation of the cross correlation method by using PIV standard images

    Effects of various parameters for PIV image acquiring and processing on the final velocity field is studied by using PIV standard images (Okamoto et al., 1997) to evaluate the cross correlation method. The stu...

    H. Hu, T. Saga, T. Kobayashi, K. Okamoto, N. Taniguchi in Journal of Visualization (1998)