A method for monitoring the visibility of luminous target objects in video cloud fog

Abstract

The invention discloses a method for monitoring the visibility of light-emitting target object video group fog. Several cameras are set, and constant light emitters are respectively set at distances of 50m, 100m, and 200m from a single camera, and the rectangle in the center of the constant light emitter is intercepted in the screenshot of the video. The screenshot of the box area is used as the characteristic picture of the light domain, and three characteristic rectangular ring areas are determined from the center point of the rectangular box area to the surroundings, according to the brightness difference, standard deviation, ring standard difference, center ring difference and horizontal visibility of the constant illuminant The linear regression model is used to obtain the average level of visibility between the camera and constant illuminants at 50m, 100m, and 200m. The method for monitoring the visibility of luminous target object video group fog in 24 hours without interruption in real time can monitor the average visibility of group fog effectively, improve the timeliness and accuracy of monitoring, and can assist in quickly determining the area where group fog occurs, reducing the risk of road group Traffic accidents caused by fog.

Description

technical field [0001] The invention relates to the technical field of meteorological monitoring, in particular to a method for monitoring the visibility of luminous target video mass fog. Background technique [0002] The fog is usually generated in the medium and small-scale circulation system and distributed in clusters. The coverage of the highway fog is relatively small, often less than 5 kilometers. The horizontal visibility in the fog is very low, and the visibility is less than 200 meters. The fog mass on the expressway has been recognized as a "mobile killer", which often causes major traffic accidents, and the accident fatality rate is higher than other traffic accidents. Compared with other fogs, mass fog has the characteristics of locality, small scope, suddenness, and easy flow, which has a great impact on the timeliness and accuracy of monitoring. [0003] Domestic research started late and developed rapidly, which can be roughly classified into three types. ...

AI Technical Summary

Problems solved by technology

Some studies have been transformed into experimental products, such as the monitoring of visibility based on the digital camera visibility system and its comparative experiments. Two groups of target black bodies and target light source units with different distances on a straight line are photographed and the visibility is calculated based on the relationship between visibility and extinction coefficient. , the light source conditions are very harsh, and the observation value is not stable enough in the early morning and evening, so it is difficult to apply all day

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