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Proceedings Paper

Instant relighting of volumetric data
Author(s): Tien-Tsin Wong; Chi-Wing Fu; Ping-Fu Fung; Keung-Tat Lee; Pheng-Ann Heng
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Paper Abstract

During the visualization of volume data, changing the illumination condition provides us a way to reveal and emphasize the local structures within the volume. However, volume rendering with real-time lighting control is hard. It requires the re-computation of the amount of light received at each voxel after the attenuation, whenever the user changes the lighting condition. In this paper, we describe an image-based approach to relight (change the illumination) the volume in real time. The nature of image-based rendering decouples the rendering time complexity from the resolution of volume data. Hence, real-time relighting of volumetric data is possible even shadow (attenuation) is taken into account. Instead of re-computing all the lighting information, we pre-render (sample) a set of images (reference images) of the volumetric data under different illumination conditions. With these reference images, we are able to relight the volume under desired lighting condition by interpolating and superimposing pixel values. The relighting can be performed on ordinary PCs.

Paper Details

Date Published: 30 May 2003
PDF: 11 pages
Proc. SPIE 5029, Medical Imaging 2003: Visualization, Image-Guided Procedures, and Display, (30 May 2003); doi: 10.1117/12.479629
Show Author Affiliations
Tien-Tsin Wong, Chinese Univ. of Hong Kong (China)
Chi-Wing Fu, Indiana Univ. (United States)
Ping-Fu Fung, Chinese Univ. of Hong Kong (China)
Keung-Tat Lee, Chinese Univ. of Hong Kong (China)
Pheng-Ann Heng, Chinese Univ. of Hong Kong (China)

Published in SPIE Proceedings Vol. 5029:
Medical Imaging 2003: Visualization, Image-Guided Procedures, and Display
Robert L. Galloway Jr., Editor(s)

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