Road Weather Management Program
photos of lightning, trucks plowing snow, an empty road before a storm, and an evacuation
Office of Operations 21st century operations using 21st century technologies

Best Practices for Road Weather Management Version 2.0

Title:

Atmospheric Visibility Measurements using Video Cameras: Relative Visibility

Abstract:

The objective of this research was to advance the visibility measurement technologies that compute visibility through processing images captured by video cameras. There are fundamental difficulties in measuring visibility. A solution presented in this report is to measure visi using visual propereties of video image (perceived info) instead of indirectly measuring physical properties of atmosphere and converting them to visi. The spatial variance problem in visibility was solved by introducing a new concept of relative measurement of visual information referred to as Relative Visibility (RV). This report also includes a study result on the limitation of CCD cameras in visibility measurement applications, and shows how to overcome them through spatially arranged multiple targets. In addition, various apparatuses of Near Infrared (NIR) light source and cameras for measuring night visibility were explored.

Source(s):

University of Minnesota Duluth, Department of Electrical and Computer Engineering; Prepared for Minnesota DOT

http://www.d.umn.edu/~tkwon/research/FinRepVisibilityV3.pdf

Date: 2004

Author:

Kwon

Keywords:


Visibility

PDF files can be viewed with the Acrobat® Reader®.

Office of Operations