Title: | Accelerating virtual endoscopy |
Authors: | Koloszár, József Jae-Young, Yi |
Citation: | Journal of WSCG. 2003, vol. 11, no. 1-3. |
Issue Date: | 2003 |
Publisher: | UNION Agency – Science Press |
Document type: | článek article |
URI: | http://wscg.zcu.cz/wscg2003/Papers_2003/C79.pdf http://hdl.handle.net/11025/1649 |
ISSN: | 1213-6972 |
Keywords: | vizualizace objemu;sledování paprsku;virtuální endoskopie;virtuální kolonoskopie |
Keywords in different language: | volume visualization;ray tracing;virtual endoscopy;virtual colonoscopy |
Abstract: | Applying volumetric ray tracing in interactive visualization has always been limited by low rendering speeds. This paper presents methods for accelerating first-hit ray tracing based virtual endoscopy with negligible impact on image quality, which aim at improving empty-space traversal (tracing all rays to the colon wall and storing the results in a depth buffer) and shading (surface normal approximation at hit locations and simple Phong shading applied to obtain pixel color). The first method proposed accelerates empty-space traversal by exploiting inter-ray coherence based on the fact that the colon wall is a (C2) continuous natural surface, which does not exhibit erratic behavior, such as sharp jumps, steps or edges. The second method presented improves shading performance by using conditional interpolation in pixel space. Results have been successfully implemented in the virtual colonoscopy application ColVis, maintained by the author. |
Rights: | © UNION Agency – Science Press |
Appears in Collections: | Volume 11, number 1-3 (2003) |
Please use this identifier to cite or link to this item:
http://hdl.handle.net/11025/1649
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