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Road weather detection method based on video

A detection method and road technology, applied in the field of video-based road weather detection, can solve the problem that the visibility status and changes of the video area cannot be truly reflected

Active Publication Date: 2015-07-01
ANHUI WANTONG TECH
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Problems solved by technology

[0008] The present invention designs a road weather detection method based on video, which solves the technical problem that the visibility data obtained by video image analysis is not quantitative time-to-time data that changes with the change of visibility, and cannot truly reflect the overall visibility in the video area status and changes

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Embodiment Construction

[0016] Combine below figure 1 with figure 2 , To further explain the present invention:

[0017] Since human eyes are more sensitive to brightness information than color information, currently only the brightness information of the image is analyzed and processed, and the color information is temporarily ignored. In 1924, Koschmieder proposed: with the sky as the background, the relationship between the observed brightness and distance of the observed luminous object, as shown in formula (1), L is the observed brightness of the object. L 0 Is its own brightness.

[0018] Formula 1)

[0019] Where: L f Is the brightness of the sky and k is the extinction coefficient of the atmosphere.

[0020] On the basis of the existing video visibility research, the present invention adopts the camera self-calibration technology to recover the distance information in the image and establishes the virtual target with the road as the background, and avoids the detection algorithm and its system av...

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Abstract

The invention relates to a road weather detection method based on a video. The method comprises the following steps of recovering distance information in an image by using a computer calibration technology; establishing a virtual target by using a road surface as the background, so as to avoid erecting target entities with distance information at two sides of the road; jumping to a preset position by a camera; matching the target image; reaching the preset position by the camera; removing influence of noise to the target edge by adopting a small wave changing method, and extracting pixel points belonging to the edge; performing target characteristic extraction by using a model consistent with human eye contrast ratio; performing human eye visibility curve fitting according to the characteristic information and distance information of the target, and finally obtaining visibility distance according to the obtained human eye visibility transformation curve and combining the human eye contrast threshold value of 0.05 recommended by authority of CIE (International Commission Illumination).

Description

Technical field [0001] The invention relates to a road weather detection method based on video. Background technique [0002] In recent years, the mileage of highways in my country has been increasing, and severe weather such as heavy fog, heavy rain, ice and snow has become the main factor affecting traffic safety and efficiency. Due to the erratic road weather, coupled with various specific geological conditions of the expressway, it is very easy to quickly produce local short-term or long-term rain, snow, mass fog and other special meteorological conditions on the road. It is difficult to obtain through the forecast of the meteorological department, and the driver is driving on the highway at high speed, because he does not get early warning, he has no knowledge of the road conditions ahead, and it is impossible to take corresponding preventive measures. Rear-end collision and collision accidents are extremely likely to occur. In addition, highway speeds are relatively high. ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01W1/00
Inventor 高泉峰毛军孙雳朱昀高大明曹群杜鹏余婷
Owner ANHUI WANTONG TECH
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