Visibility detection method based on video images
A technology of video image and detection method, applied in the field of visibility detection, which can solve problems such as environmental interference and dependence on additional hardware facilities
Active Publication Date: 2016-03-23
BEIJING JIAOTONG UNIV
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[0006] The purpose of the present invention is to provide a method for detecting visibility based on video images, which solves the problems of existing methods that are susceptible to environmental interference and need to rely on additional hardware facilities
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[0065] In order to illustrate the present invention more clearly, the present invention will be further described below in conjunction with preferred embodiments and accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. Those skilled in the art should understand that the content specifically described below is illustrative rather than restrictive, and should not limit the protection scope of the present invention.
[0066] Such as figure 1 As shown, the video image-based visibility detection method provided in this embodiment includes the following steps:
[0067] S1. Obtain the dark channel image of the video image of the region to be detected;
[0068] S2. Estimate the atmospheric illumination value of the video image according to the dark channel image;
[0069] S3. Calculate the estimated atmospheric transmittance of the video image according to the atmospheric light value of the video image, and calculate the estimated visibili...
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The invention discloses a visibility detection method based on video images. The method includes the steps that firstly, dark channel images of video images of an area to be detected are obtained; secondly, atmosphere illumination values of the video images are estimated; thirdly, estimated atmosphere transmissivity of the video images is calculated, and estimated visibility of the video images is calculated; fourthly, a sky region and a non-sky region in the dark channel images are recognized through the region growth method; fifthly, correction factors of transmissivity of the sky region and the non-sky region of the video images are selected; sixthly, according to the correction factors of transmissivity of the sky region and the non-sky region of the video images, the atmosphere transmissivity of the video images is calculated, and visibility of the video images is calculated according to the atmosphere transmissivity of the video images. The method combines the advantages of the digital photographing method and the advantages of the transmission method, the structure is simple, hardware facilities do not need to be built again, and the method can be applied to visibility real-time detection of various environments and is particularly applicable to real-time detection of highway visibility.
Description
technical field [0001] The invention relates to the technical field of visibility detection. More specifically, it relates to a method for detecting visibility based on video images. Background technique [0002] Low visibility is an important cause of road traffic accidents. Especially on the expressway, the vehicle speed is fast, the traffic is large, and its own characteristics of fully enclosed and full overpass require vehicles not to slow down and stop arbitrarily. When running into low-visibility weather, it is very likely to cause serious traffic accidents involving continuous rear-end collisions by many vehicles. With the development of my country's transportation industry, the mileage of expressways is growing rapidly, and the number of motor vehicles is also increasing. These factors lead to the rapid increase of traffic accidents and casualties on expressways. Timely and accurate detection of low visibility and early warning response are of great significance ...
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IPC IPC(8): G01N21/59G06T7/00
CPCG01N21/59G06T7/0004G06T2207/10016
Inventor 赵建东韩明敏
Owner BEIJING JIAOTONG UNIV