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A Technique for Specifying Region of Interest in the Vector Field Based on 3D LIC

[+] Author Affiliations
Koji Sakai

Research Institute for Environmental Sciences and Public Health of Iwate Prefecture, Morioka-shi, Iwate, Japan

Koji Koyamada

Kyoto University, Kyoto-shi, Kyoto, Japan

Kazuma Kamisawa, Akio Doi

Iwate Prefectural University, Iwate, Japan

Paper No. PVP2002-1531, pp. 11-19; 9 pages
doi:10.1115/PVP2002-1531
From:
  • ASME 2002 Pressure Vessels and Piping Conference
  • Computational Technologies for Fluid/Thermal/Structural/Chemical Systems With Industrial Applications, Volume 1
  • Vancouver, BC, Canada, August 5–9, 2002
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 0-7918-4659-8
  • Copyright © 2002 by ASME

abstract

Line integral convolution (LIC) is an effective and powerful technique for generating images from vector fields. In the 3D-LIC, it is very important to select an adequate region of interest (ROI) in the vector field. One way for specifying ROI is to use a surface defined in the vector field. Another way is to use a significance map that defines an ROI related value at each point in the vector field. To represent an anisotropic vector field around a vortex center in an understandable way, we introduced a time-oriented significance map. Our technique for specifying ROI is to use a passage-time for a mass-less particle to travel from nearby vortex center to a pixel location. In our technique, what we call “restricted LIC technique (RLIC),” refers to the passage-time buffer before we start the convolution process at a pixel location. The original RLIC technique is 2-D based. In this paper, we extend this technique to 3-D. To confirm the effectiveness of our technique, we use an anisotropic swirl vector field and construct two types of significance maps, a dlstance-oriented map and a time-oriented map. We will show the difference in the resulting images that are generated from these significance maps.

Copyright © 2002 by ASME

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