USC

ICT

GL

Direct HDR Capture of the Sun and Sky
AFRIGRAPH 2004 Paper
SIGGRAPH 2004 Poster

Jessi Stumpfel   Andrew Jones   Andreas Wenger   Chris Tchou   Tim Hawkins   Paul Debevec
USC Institute for Creative Technologies

f/4, 1s f/4, 1/4s f/4, 1/32s f/16, 1/16s f/16, 1/125s f/16, 1/1000s f/16, 1/8000s

 


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.

 


Material:

AFRIGRAPH 2004 Paper:

Jessi Stumpfel's Master's Thesis:

SIGGRAPH 2004 Poster Abstract:

SIGGRAPH 2004 Poster Image:

SIGGRAPH 2004 Video:


Captured Light probes:
Hour           File
6:00 0600.rar            (47.4 MB)
7:00 0700.rar            (160 MB)
8:00 0800.rar            (160 MB)
9:00 0900.rar            (153 MB)
10:00 1000.rar            (160 MB)
11:00 1100.rar            (136 MB)
12:00 1200.rar            (130 MB)
13:00 1300.rar            (130 MB)
14:00 1400.rar            (134 MB)
15:00 1500.rar            (141 MB)
16:00 1600.rar            (141 MB)
17:00 1700.rar            (171 MB)
18:00 1800.rar            (73.3 MB)
ADDITIONAL RESOURCES:

For capturing the sky we used a Canon EOS-1ds with a Sigma 8mm lens. To control the camera, we used the Canon Digital Camera SDK. This C library provides the ability to set camera settings such as F-stop and exposure time, release the shutter remotely, and download images via firewire or USB.