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Visibility detecting method based on high definition video

A detection method, high-definition video technology, applied in the direction of color/spectral characteristic measurement, image data processing, instrument, etc., can solve the problems that human confirmation cannot be carried out

Inactive Publication Date: 2011-08-24
NORTH CHINA UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

This measurement method can usually only measure the atmospheric visibility of a single point area, which is one-dimensional information and cannot be manually confirmed

Method used

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  • Visibility detecting method based on high definition video
  • Visibility detecting method based on high definition video
  • Visibility detecting method based on high definition video

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Embodiment Construction

[0028] In order to make it easy for those skilled in the art to understand the technical means, creation features, goals and effects achieved by the present invention, the present invention will be further described below with reference to the specific figures.

[0029] By comparing and analyzing images of severe weather such as fog and images of clear weather, it is found that any non-sky area in the image taken in clear weather will always have a color channel with low color brightness value, while the image taken in foggy weather has a color channel with low color brightness value. In any given area, the lowest brightness value is very close to the average value of the area, so the present invention uses this difference in image imaging (called black channel) to estimate the light transfer function of the atmospheric imaging model, and then use the transfer function The relationship between the atmospheric extinction coefficient and the atmospheric extinction coefficient is ...

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Abstract

The invention discloses a visibility detecting method based on a high definition video (2592*1936) to realize all-weather visibility detection. The detection method comprises the followings steps: step 1, collecting a high definition image; step 2, calibrating the image, and calculating the distance D (x) of a tested object; step 3, calculating the radiance value A of the global atmosphere of the image; step 4, calculating the transmission coefficient of light t (x); step 5, calculating atmospheric extinction coefficient and visibility; and step 6, performing visibility alarming. Through the method provided by the invention, the visibility situation of a road can be reported for the traffic administrative department timely and effectively, alarm is issued, the driving dangers in severe weather such as heavy fog, rain and snow can be reduced, and the traffic safety can be ensured.

Description

technical field [0001] The invention relates to a visibility detection method based on high-definition video, which is used for all-weather visibility detection of traffic roads. Background technique [0002] The frequent occurrence of major road traffic accidents caused by reduced visibility has attracted great attention from governments around the world. Heavy fog is prone to occur in some seaside or mountain cities, reducing visibility to below 200 meters and causing traffic accidents. [0003] The World Meteorological Organization stipulates that for the meteorological visibility V, the visual threshold is ε=0.02, which is equivalent to the distance when the target disappears. Thus, the instrumental formula for calculating meteorological visibility from the atmospheric extinction coefficient σ is obtained: [0004] V 002 = - 3.912 σ [0005] Taking the visual threshold ε=0.05, which...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/25G06T7/00
Inventor 李正熙张福生熊昌镇张永忠刘小明王力李颖宏张海波陈兆盟王玉全
Owner NORTH CHINA UNIVERSITY OF TECHNOLOGY
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