Fast image synthesis of virtual objects in a real scene with natural shadings

  • Authors:

  • Imari Sato;Morihiro Hayashida;Fumiyo Kai;Yoichi Sato;Katsushi Ikeuchi

  • Affiliations:

  • The National Institute of Informatics, Tokyo, 101-8430 Japan;Bioinformatics Center, Institute for Chemical Research, Kyoto University, Kyoto, 611-0011 Japan;Sekisui Chemical Co., Ltd., Urban Infrastructure & Environmental Products Headquarters, Kyoto, 601-8105 Japan;Institute of Industrial Science, The University of Tokyo, Tokyo, 153-8505 Japan;Interfaculty Initiative in Information Studies, The University of Tokyo, Tokyo, 113-0033 Japan

  • Venue:
  • Systems and Computers in Japan
  • Year:
  • 2005

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Abstract

We propose a new method for superimposing synthetic objects with natural shadings and cast shadows onto a real scene whose illumination condition is dynamically changing in this paper. In general, high computational cost for rendering virtual objects with convincing shading and shadows, such as interreflections or shadows under area light sources, prohibits real-time synthesis of such composite images with superimposed virtual objects. To overcome this limitation, we take advantage of the linearity of the relationship between brightness changes observed on an object surface and change of illumination radiance in a scene and introduce an efficient rendering technique based on a linear combination of pre-rendered reference images of the scene. We have successfully tested the proposed method in a natural illumination condition of an indoor environment to demonstrate how fast the method could superimpose a virtual object onto the scene with highly realistic shadings and shadows. © 2005 Wiley Periodicals, Inc. Syst Comp Jpn, 36(14): 102–111, 2005; Published online in Wiley InterScience (). DOI 10.1002/scj.10155