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Best Practices for Road Weather Management Version 2.0

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Title:

A Method of Processing CCTV Digital Images for Poor Visibility Identification

Abstract:

This study proposes a method for identifying poor visibility under adverse weather conditions by processing CCTV digital images. The Weighted Intensity of Power Spectra (WIPS) was examined to determine its applicability as a value for identifying poor visibility. The magnitude of WIPS represents the difference in spatial frequencies within the image based on human contrast sensitivity function. Two kinds of experiments were performed to determine whether the WIPS represented the Subjective Visibility Assessment Values (SVAV) given by test subjects. We found clear linear relationships between the WIPS and the SVAV in both experiments. In addition, the two correlation lines overlapped within the whole range of the WIPS. These results suggest that WIPS may be appropriate for identifying poor visibility using digital images.

Source(s):

85th Transportation Research Board (TRB) Annual Meeting; Hokkaido University, Docon Co., Hokkaido Development Engineering Center, Japan Weather Association (Japan). For an electronic copy of this resource, please direct your request to WeatherFeedback@dot.gov.

Date: 2006

Author:

Hagiwara, et al

Keywords:


Closed Circuit Television (CCTV)

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