Direct HDR Capture of the Sun and Sky (bibtex)
by Jessi Stumpfel, Andrew Jones, Andreas Wenger, Chris Tchou, Tim Hawkins, Paul Debevec
Abstract:
We present a technique for capturing the extreme dynamic range of natural illumination environments that include the sun and sky, which has presented a challenge for traditional high dynamic range photography processes. We find that through careful selection of exposure times, aperture, and neutral density filters that this full range can be covered in seven exposures with a standard digital camera. We discuss the particular calibration issues such as lens vignetting, in- frared sensitivity, and spectral transmission of neutral den- sity filters which must be addressed. We present an adap- tive exposure range adjustment technique for minimizing the number of exposures necessary. We demonstrate our results by showing time-lapse renderings of a complex scene illuminated by high-resolution, high dynamic range natural illumination environments.
Reference:
Direct HDR Capture of the Sun and Sky (Jessi Stumpfel, Andrew Jones, Andreas Wenger, Chris Tchou, Tim Hawkins, Paul Debevec), In Proceedings of the 3rd International Conference on Computer Graphics, Virtual Reality, Visualisation and Interaction in Africa, 2004.
Bibtex Entry:
@inproceedings{stumpfel_direct_2004,
	address = {Stellenbosch, South Africa},
	title = {Direct {HDR} {Capture} of the {Sun} and {Sky}},
	url = {http://ict.usc.edu/pubs/Direct%20HDR%20Capture%20of%20the%20Sun%20and%20Sky.pdf},
	abstract = {We present a technique for capturing the extreme dynamic range of natural illumination environments that include the sun and sky, which has presented a challenge for traditional high dynamic range photography processes. We find that through careful selection of exposure times, aperture, and neutral density filters that this full range can be covered in seven exposures with a standard digital camera. We discuss the particular calibration issues such as lens vignetting, in- frared sensitivity, and spectral transmission of neutral den- sity filters which must be addressed. We present an adap- tive exposure range adjustment technique for minimizing the number of exposures necessary. We demonstrate our results by showing time-lapse renderings of a complex scene illuminated by high-resolution, high dynamic range natural illumination environments.},
	booktitle = {Proceedings of the 3rd {International} {Conference} on {Computer} {Graphics}, {Virtual} {Reality}, {Visualisation} and {Interaction} in {Africa}},
	author = {Stumpfel, Jessi and Jones, Andrew and Wenger, Andreas and Tchou, Chris and Hawkins, Tim and Debevec, Paul},
	month = nov,
	year = {2004},
	keywords = {Graphics}
}
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