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Multi-Viewpoint Display by Projection onto Cylindrical Fog Screen Masataka IMURA We have been developing a novel fog display system that enables users to observe a virtual object from multiple viewpoints. The proposed display consists of one cylindrical fog screen and multiple surrounding projectors. Due to Mie scattering, which is strong forward scattering of light, users can see the image which comes from the frontal projector only. User s head movement around the cylindrical fog screen arises motion parallax that helps 3D recognition of a shape of the virtual object. This immaterial display has another advantage that the display enables direct touching operation to the virtual objects by users hands. Consistency of visual and somatic sensation increases the reality of the virtual object. Key words: immaterial display, fog, projection, Mie scattering, interaction 1 2011 1. 1. 1 560 8531 1 3 E-mail: imura@bpe.es.osaka-u.ac.jp 43 10 2014 469 21

2 3 4 5, 6 7 See Linder 8 Transpost 9 RayModeler 10 1. 2 Rakkolainen 11 12 13 14 2. 15 16 2. 1 470 22 [a.u.] [deg] 1 mm mm 0.4 0.7 mm 17 2. 2 1 1 2

2. 3 2. 4 43 10 2014 2 1. CG 2. 1 3. 4. 3 2. 5 LED 3. 3. 1 3 80 mm 5 mm 50 mm 70 LED 400-PRJ014 471 23

3 BK 5 2 1 Linux PC 5 USB C910 820 mm IR-82 3. 2 20 50 mm 5 4 a 4 a 40 20 0 20 40 4 b 5 4 a 4 c 10 5 6 4 a b c 472 24

5 7 ab 6 a b 3. 3 LED 7 a 7 b 8 a y 8 b 43 10 2014 8 ab 1 NTS 2008 pp. 391 398. 2 H. Kimura, A. Asano, I. Fujishiro, A. Nakatani and H. Watanabe: True 3D display, ACM SIGGRAPH 2011 Emerging Technologies 2011 Article No. 20. 3 K. Kameyama, K. Ohtomi and Y. Fukui: A virtual reality system using a volume scanning 3D display, Proceedings of Internationcal Conference on Artificial Reality and Telexistence 1992 pp. 49 62. 4 G. E. Favalora, J. Napoli, D. M. Hall, R. K. Dorval, M. G. Giovinco, M. J. Richmond and W. S. Chun: 100 million-voxel volumetric display, Proceedings of 16th Annual International Symposium on Aerospace/Defense Sensing, Simulation, and Controls 2002 pp. 300 312. 5 S. Eitoku, T. Tanikawa, Y. Suzuki, K. Hirota, T. Iwai and M. Hirose: Display composed of water drops for filling space with materialized virtual three-dimensional objects, Virtual Reality Conference 2006 pp. 159 166. 6 P. C. Barnum, S. G. Narasimhan and T. Kanade: A multilayered display with water drops, ACM SIGGRAPH 2010 Papers 2010 Article No. 76. 7 56 2002 867 871. 8 T. Yendo, N. Kawakami and S. Tachi: Seelinder: The cylindrical lightfield display, ACM SIGGRAPH 2005 Emerging Technologies 2005 Article No. 16. 9 R. Otsuka, T. Hoshino and Y. Horry: Transpost: A novel approach to the display and transmission of 360 degrees-viewable 3D solid images, IEEE Trans. Visualization and Computer Graphics, 12 2006 178 185. 10 K. Ito, H. Kikuchi, H. Sakurai, I. Kobayashi, H. Yasunaga, H. Mori, K. Tokuyama, H. Ishikawa, K. Hayasaka and H. Yanagisawa: 360-degree autostereoscopic display, ACM SIGGRAPH 2010 Emerging Technologies 2010 Article No. 1. 473 25

11 I. Rakkolainen, S. DiVerdi, A. Olwal, N. Candussi, T. Hüllerer, M. Laitinen, M. Piirto and K. Palovuori: The interactive fogscreen, ACM SIGGRAPH 2005 Emerging Technologies 2005 Article No. 8. 12 2012 2012 pp. 755 758. 13 2008 p. 197 14 C. Lee, S. DiVerdi and T. Höllerer: Depth-fused 3D imagery on an immaterial display, IEEE Trans. Visualization and Computer Graphics, 15 2009 20 33. 15 A. Yagi, M. Imura, Y. Kuroda and O. Oshiro: 360-degree fog projection interactive display, SIGGRAPH Asia 2011 Emerging Technologies 2011 Article No. 19. 16 17 2012 409 417. 17 J. A. Stratton: Electromagnetic Theory, Chapter 9 McGraw-Hill, New York, 1941 pp. 563 567. 2014 5 26 474 26

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