A method and system for rapid estimation of highway visibility in foggy weather

Abstract

The invention relates to a method and system for quickly estimating the visibility of expressways in foggy weather. The method includes: performing edge detection on the foggy highway scene captured by the camera according to the highway lane and white line interval standards, and combining the scene geometric model to fit the mapping between the depth of field and the pixel in the foggy highway scene relationship; according to the mapping relationship, determine the actual distance between the farthest point identifiable by the camera and the camera; obtain the transmittance of the target object in the scene to the camera based on the prior theory of dark channel; Optimizing to obtain the optimized transmittance; determining the attenuation coefficient of the foggy expressway scene according to the optimized transmittance and the actual distance; determining the visibility value of the foggy expressway according to the attenuation coefficient. The invention can accurately and rapidly estimate the visibility of the expressway in foggy days.

Description

technical field [0001] The invention relates to the field of visibility estimation, in particular to a method and system for quickly estimating the visibility of a foggy expressway. Background technique [0002] In the autumn and winter season, the temperature difference between morning and evening is large, and foggy weather occurs frequently. The foggy weather scene on the expressway seriously threatens the life and property safety of driving vehicles. Therefore, it is necessary to effectively estimate the visibility of the expressway. However, the visibility estimation in the prior art is estimated by a laser visibility meter, which is a common visibility detection instrument, but if a large number of laser visibility meters are used to fully cover the national expressway network, it will cost a lot of money. There are also shortcomings such as small detection range, high maintenance cost, slow visibility estimation and low estimation accuracy. Contents of the invention...

AI Technical Summary

Problems solved by technology

However, the visibility estimation in the prior art is estimated by a laser visibility meter, which is a common visibility detection instrument, but if a large number of laser visibility meters are used to fully cover the national expressway network, it will cost a lot of money. There are also shortcomings such as small detection range, high maintenance cost, slow visibility estimation and low estimation accuracy.

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