Events

Jessi Stumpfel, Andrew Jones, Andreas Wagner, Chris Tchou, Tim Hawkins, Paul Debevec: “Direct HDR Capture of the Sun and Sky”

November 3, 2004 | Stellenbosch, South Africa

Speaker: Jessi Stumpfel, Andrew Jones, Andreas Wagner, Chris Tchou, Tim Hawkins, Paul Debevec
Host: 3rd International Conference on Computer Graphics, Virtual Reality, Visualisation and Interaction in Africa (AFRIGRAPH 2004)

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.