Instant relighting of volumetric data

Tien-Tsin Wong; Chi-Wing Fu; Ping-Fu Fung; Keung-Tat Lee; Pheng-Ann Heng

doi:10.1117/12.479629

30 May 2003 Instant relighting of volumetric data

Tien-Tsin Wong, Chi-Wing Fu, Ping-Fu Fung, Keung-Tat Lee, Pheng-Ann Heng

Proceedings Volume 5029, Medical Imaging 2003: Visualization, Image-Guided Procedures, and Display; (2003) https://doi.org/10.1117/12.479629
Event: Medical Imaging 2003, 2003, San Diego, California, United States

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.

Citation Download Citation

Tien-Tsin Wong, Chi-Wing Fu, Ping-Fu Fung, Keung-Tat Lee, and Pheng-Ann Heng "Instant relighting of volumetric data", Proc. SPIE 5029, Medical Imaging 2003: Visualization, Image-Guided Procedures, and Display, (30 May 2003); https://doi.org/10.1117/12.479629

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KEYWORDS

Light sources

Opacity

Light sources and illumination

Signal attenuation

Visualization

Head

Volume rendering

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