NDLI: Direct HDR capture of the sun and sky ( AFRIGRAPH '04 )

Content Provider	ACM Digital Library
Author	Hawkins, Tim Tchou, Chris Jones, Andrew Wenger, Andreas Debevec, Paul Stumpfel, Jessi
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, infrared sensitivity, and spectral transmission of neutral density filters which must be addressed. We present an adaptive 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.
Starting Page	145
Ending Page	149
Page Count	5
File Format	PDF
ISBN	1581138636
DOI	10.1145/1029949.1029977
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2004-11-03
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Lighting Image-based lighting High dynamic range photography Real-world capture Photometry
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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Direct HDR capture of the sun and sky ( AFRIGRAPH '04 )