“Direct HDR Capture of the Sun and Sky” by Stumpfel, Jones, Wenger, Tchou, Hawkins, et al. …
Conference:
Type:
Entry Number: 050
Title:
- Direct HDR Capture of the Sun and Sky
Presenter(s)/Author(s):
Abstract:
Recent techniques employing omnidirectional high dynamic range photography have produced useful datasets of real-world illumination environments [Debevec and Malik 1997], which have been used as sources of illumination for rendering. While much work has been done to simulate sky models [Preetham et al. 1999], current techniques have not been able to record an outdoor environment that includes a directly visible sun, which is an important type of environment to capture.
There are two principal challenges in capturing the full dynamic range of outdoor illumination. The first is the breadth of the range – the sun can be well over five orders of magnitude (or seventeen stops) brighter than the sky and clouds, which is a greater range than can be covered with typically available shutter speeds. The second is the absolute intensity of the sun, which is much brighter than what cameras are designed to capture.
References:
1. 2004. Canon digital camera software developers kit information. http://www.powershot.com/powershot2/customer/developer.html.Google Scholar
2. Debevec, P. E., and Malik, J. 1997. Recovering high dynamic range radiance maps from photographs. In Proceedings of SIGGRAPH 97, Computer Graphics Proceedings, Annual Conference Series, 369–378.
3. Preetham, A. J., Shirley, P. S., and Smits, B. E. 1999. A practical analytic model for daylight. In Proceedings of SIGGRAPH 99, Computer Graphics Proceedings, Annual Conference Series, 91–100.
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