Information
- Publication Type: Conference Paper
- Workgroup(s)/Project(s):
- Date: October 2007
- Address: Bled
- Booktitle: DARKSKY2007 - 7th European Symposium for the Protection of the Night Sky
- Date (from): 5. October 2007
- Date (to): 6. October 2007
- Editor: Andrej Mohar
- Lecturer: Georg Zotti
- Location: Bled
- Keywords: HDR imaging, Light Pollution, Skylight
Abstract
Combining series of exposures with different exposure times made with a digital SLR camera and a fish-eye lens allow to create high-resolution images that contain the full dynamic
range of daylight, including the Sun, usable as scene background and for skylight illumination computation purposes. These High Dynamic Range (HDR) images can also be calibrated with a luminance meter, so the image
data contain meaningful values, and the system becomes a measuring device. At night, long-time exposures can be combined, and the setup, once fine-calibrated with a Sky Quality
Meter or another low-level light measuring device, becomes a valuable tool to provide absolute values of sky brightness. Using data from
the astronomical literature, false-colour plots of sky luminance can be created that closely match visual estimation of visible stellar magnitudes.
Additional Files and Images
Weblinks
No further information available.
BibTeX
@inproceedings{zotti-2007-hdr,
title = "Measuring Light Pollution with a Calibrated High Dynamic
Range All-Sky Image Acquisition System",
author = "Georg Zotti",
year = "2007",
abstract = "Combining series of exposures with different exposure times
made with a digital SLR camera and a fish-eye lens allow to
create high-resolution images that contain the full dynamic
range of daylight, including the Sun, usable as scene
background and for skylight illumination computation
purposes. These High Dynamic Range (HDR) images can also be
calibrated with a luminance meter, so the image data contain
meaningful values, and the system becomes a measuring
device. At night, long-time exposures can be combined, and
the setup, once fine-calibrated with a Sky Quality Meter or
another low-level light measuring device, becomes a valuable
tool to provide absolute values of sky brightness. Using
data from the astronomical literature, false-colour plots of
sky luminance can be created that closely match visual
estimation of visible stellar magnitudes.",
month = oct,
address = "Bled",
booktitle = "DARKSKY2007 - 7th European Symposium for the Protection of
the Night Sky",
editor = "Andrej Mohar",
location = "Bled",
keywords = "HDR imaging, Light Pollution, Skylight",
URL = "https://www.cg.tuwien.ac.at/research/publications/2007/zotti-2007-hdr/",
}