Real-Time Camera Walks Using Light Fields
An interesting alternative to traditional geometry based rendering is Light Field Rendering [1,2]. A camera gantry is used to acquire authentic imagery and detailed novel views are synthetically generated from unknown viewpoints. The drawback is the significant data on disk.
Moving from static images, a walkthrough or a camera walk through the implied virtual world is often desirable but the repeated access of the large data makes the task increasingly difficult. We note that although potentially infinite walkthroughs are possible, for any given path, only a subset of the previously stored light field is required. Our prior work  exploited this and reduced the main memory requirement. However, considerable computational burden is encountered in processing even this reduced subset. This negatively impacts real-time rendering.
In this paper, we subdivide the image projection plane into “cells,” each of which gets all its radiance information from the cached portions of the light field at select “nodal points.” Once these cells are defined, the cache is visited systematically to find the radiance efficiently. The net result is real-time camera walks.
Unable to display preview. Download preview PDF.
- 3.Pandey, A., Choudhury, B., Chandran, S.: Efficient lightfield based camera walk. In: Fourth Indian Conference on Computer Vision, Graphics and Image Processing ICVGIP, pp. 302–307 (2004)Google Scholar
- 4.Debevec, P., Gortler, S.: Image-based modeling and rendering. In: SIGGRAPH 1998 Course Notes. ACM SIGGRAPH, Addison Wesley, Reading (1998)Google Scholar
- 7.Unger, J., Wenger, A., Hawkins, T., Gardner, A., Debevec, P.: Capturing and rendering with incident light fields. In: EGRW 2003: Proceedings of the 14th Eurographics workshop on Rendering, Aire-la-Ville, Switzerland, Switzerland, Eurographics Association, pp. 141–149 (2003)Google Scholar
- 11.Adelson, E.H., Bergen, J.R.: The Plenoptic Function and the Elements of Early Vision. In: Computational Modeling of Vision Processing, MIT Press, Cambridge (1991)Google Scholar
- 13.Sharma, P., Parashar, A., Banerjee, S., Kalra, P.: An Uncalibrated Lightfield Acquisition System. In: Third Indian Conference on Computer Vision, Graphics and Image Processing ICVGIP, pp. 25–30 (2002)Google Scholar