Journal of the Korea Society of Computer and Information (한국컴퓨터정보학회논문지)

Korean Society of Computer Information (한국컴퓨터정보학회)
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A Study on Distance Estimation in Virtual Space According to Change of Resolution of Static and Dynamic Image

가상현실공간에서 정적 및 동적 이미지의 해상도 변화에 따른 거리추정에 관한 연구

  • Ryu, Jae-Ho (School of Architecture, Seoul National University of Science & Technology)
  • 류재호 (서울과학기술대학교 건축학부)
  • Received : 2010.10.21
  • Accepted : 2010.12.04
  • Published : 2011.03.31
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Abstract

The virtual reality (VR) technology has been used as the application of architectural presentation or simulation tool in the field of industry. The high immersion and intuitive visual information are the great merits of design evaluation or environmental simulation when we are using the virtual environments. But the distortion of distance perception in VR is still a big problem when the accuracy of distance presentation is strictly required. For example, distance estimation is especially important when the virtual environments are applied to the presentational tool for evaluation the space design or planning in the field of architecture. If there are some perception error between the built space in real and represented space in virtual, the accurate design evaluation or modification of design is hard to be carried out during the design development stage. In this paper, we have carried out some experiments about distance estimation in the immersive virtual environments to verify the factors and their influence. We made a hypothesis that the lack of the information for the user in VR causes the different distance estimation from the real world because users are usually comfortable with moving fast and long distance in VR environments compared with moving slow and short distance in real space. So, we carried out basic experiment to prove our hypothesis that the lack of information makes subjects estimate the distance of walking in VR shorter compared with the same distance in real. Also, among the factors that probably affect the distance estimation in VR, we have verified the influence of the image resolution. The influence of resolution degradation of image on the distance estimation was verified with the condition of static and dynamic images. The results showed that the resolution has deep relation with the distance estimation. For example, the subject underestimated the distance at the lower resolution condition. We also found the methods of the making the lower resolution image could affect on the visual perception of subjects.

가상현실 시스템에서 높은 현실감과 직관적인 시각정보의 제공이 커다란 장점임에도 불구하고, 가상공간에서의 공간제시에 있어서 거리감각이 정확하게 전달되지 않는 문제점이 있다. 특히나 건축분야와 같은 공간을 취급하는 분야에서의 공간제시에 있어서의 왜곡문제는 시급히 해결해야할 필요성이 있다. 본 논문에서는 가상현실공간에서 거리감각을 고찰함에 있어서 거리감각을 조사하는 하나의 요소로서, 피실험자에 의한 이동거리추정판단에 관한 실험을 행하였다. 가상현실공간에서의 제시정보의 부족이 거리감각의 차이를 가져온다는 가정하에 몰입형 가상현실시스템에서 다양한 영상의 투영조건하에서 이동거리추정판단을 실험적으로 조사함으로써, 가상공간을 형성하는 시스템이 제공하는 정적, 동적 영상이미지의 특성에 의한 거리감각의 변화를 규명하고자 한다. 구체적인 실험방법으로는 실재 건축물의 복도를 모델링하여, 복도의 실재공간과 모델링된 가상공간을 피실험자에게 영상으로 제시하면서 이동거리추정판단의 심리실험을 수행하였다. 실험에 이용한 모델과 같은 실재의 복도에서도 이동거리추정판단의 실험을 동시에 수행함으로써, 실재환경과 가상현실환경과의 거리감각의 차이를 비교분석하고, 그 결과 실재환경과 비교하여 몰입형 가상현실시스템에서의 거리감각이 단축이 되는 경향이 나타남을 설명한다. 나아가, 몰입형 가상현실 시스템에 있어서 거리감각이 과소평가되는 경향이 나타나는 요인을 고찰하여, 영상의 해상도를 거리감각을 형성하는 중요한 요소로 판단하고 정적, 동적 이미지의 해상도의 변화에 따른 거리감각을 규명한다.

Keywords

References

  1. KS.H. Song, J.P. Jeong, Virtual Campus Development using 3D GIS, Journal of the Korea Society of Computer and Information (Korean), pp. 148-152, 2006.
  2. C. Cruz-Neira, D. Sandin, and T. A. DeFanti, "surround screen projection-based virtual reality: The design and implementation of the cave", Proceeding of ACM SIGGRAPH'93, pp. 135-142, January 1993.
  3. J. H. Ryu, S. Hasegawa, N. Hashimoto, and M. Sato, "Multi-projection display system for architectural design evaluation", The Association for Computer Aided Architectural Design Research in Asia 2004, pp. 901-910, 2004.
  4. J. H. Ryu, N. Hashimoto, S. Hasegawa, and M. Sato, "Developing an immersive multi-projection system with hybrid screen", International Conference on Artificial Reality and Telexistene 2002, pp. 22-29, January 2002.
  5. Shibano N, Hareesh P.V, Hoshino H, Kawamura R, Yamamoto A, Kashiwagi M and Sawada K, "CyberDome: PC Clustered Hemi Spherical Immersive Projection Display", ICAT2003, Tokyo, Japan, 2003
  6. J. P. Bliss and P. D. Tidwell, "The effectiveness of virtual reality for administering spatial navigation training to fire fighter", Presence: Teleoperators and Virtual Environments, Vol. 6, No. 1, pp. 73-86, February 1997. https://doi.org/10.1162/pres.1997.6.1.73
  7. D. Waller, E. Hunt, and D. Knapp, "The transfer of spatial knowledge in virtual environment training", Presence: Teleoperators and Virtual Environments, Vol. 7, No. 2, pp. 129-143, 1998. https://doi.org/10.1162/105474698565631
  8. J. H. Ryu, N. Hashimoto, Y. Koike, and M. Sato. "Distance estimation with various field of views and navigation interface in real and virtual space", The 10th International Conference on Virtual System and Multimedia, pp. 151-160, 2004.
  9. P. Willemsen and A. A. Gooch, "Perceived egocentric distance in real, image based, and traditional virtual environments", Proceedings of the IEEE Virtual Reality, 2002.
  10. B. G. Witmer, J. H. Railey, and B. W. Knerr, "Virtual spaces and real world places: transfer of route knowledge", Int. J. Human-Computer Studies, pp. 413-428, 1996.
  11. H. Fujii and T. Inui, "Characteristics of moving distance estimation in a cg-space", The IEICE Transaction Fundamentals of Electronics, Communications and Computer Science (Japanese), J74-D Vol. 2, No. 4, pp. 543-549, 1991.
  12. P. Willemsen, M. B. Colton, S. H. Creem-Regehr, and W. B. Thomson, "The Effects of Head-Mounted Display Mechanical Properties and Field of View on Distance Judgments in Virtual Environments", ACM Transactions on Applied Perception, Vol. 6, No. 2, Article 8, February 2009.
  13. F. Steinicke, G. Bruder, K. Hinrichs, and A. Steed, "Gradual transitions and their effects on presence and distance estimation", Computers & Graphics 34, pp. 26-33, 2010 https://doi.org/10.1016/j.cag.2009.12.003
  14. A. R. Richardson and D. Waller, "Interaction With an Immersive Virtual Environment Corrects Users'' Distance Estimates", Human Factors, Vol. 49, No. 3, pp. 507-517, June 2007. https://doi.org/10.1518/001872007X200139
  15. P. Willemsen, A. A. Gooch, W. B. Thompson, S. H. Creem-Regehr, "Effects of Stereo Viewing Conditions on Distance Perception in Virtual Environments", Presence, Vol. 17, No. 1, pp. 91-101, February 2008. https://doi.org/10.1162/pres.17.1.91