Illuminating Image-based Objects
- In this paper, we present a new scheme of data representation for image-based objects. It allows the illumination to be changed interactively without knowing any geometrical information (e.g. depth or surface normal) of the scene. But the resulting images are physically correct. The scene is first sampled from different view points and under different illuminations. By treating each pixel on the image plane as a surface element, the sampled images are used to measure the apparent BRDF of each surface element. Two compression schemes, spherical harmonics and discrete cosine transform, are proposed to compress the tabular BRDF data. Whenever the user changes the illumination, a certain number of views are reconstructed. The correct user perspective view is then displayed using the standard texture mapping hardware. Hence, the intensity, the type and the number of the light sources can be manipulated interactively.
RemarksThis is an extended version of the paper "Image-based Rendering with Controllable Illumination". New result on compressing pixel BRDFs using DCT have been included. The paper is also restructured to have a better organization.
- PostScript: illumin3.ps.gz (size: 1.4 MB)(with correction done on 23 Sept 1997)
- Acrobat: illumin3.pdf (size: 613 KB)(with correction done on 23 Sept 1997)
MoviesThe following movies demonstrate the reconstructed results of an image-based scene illuminated by different types of light sources.
Illuminated by a directional source. Illuminated by a point light source.
- " Image-based Rendering with Controllable Illumination",
T. T. Wong, P. A. Heng, S. H. Or and W. Y. Ng,
in Proceedings of the 8-th Eurographics Workshop on Rendering (Rendering Techniques'97), St. Etienne, France, June 1997, pp. 13-22.
- " Interactive Relighting of Panoramas",
T. T. Wong, C. W. Fu and P. A. Heng,
IEEE Computer Graphics & Applications, Vol. 21, No. 2, March-April 2001, pp. 32-41.
- " The Plenoptic Illumination Function",
T. T. Wong, C. W. Fu, P. A. Heng and C. S. Leung,
IEEE Transactions on Multimedia, Vol. 4, No. 3, September 2002, pp. 361-371.
(This paper received the IEEE Transactions on Multimedia Prize Paper Award 2005.)
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