A day-night switching method and device based on forward collision warning

Abstract

The invention relates to a day-night switching method and device based on front collision warning. The device includes a data extraction module, an initialization state judgment module, a switching execution module, a fault-tolerant mechanism module, a short-time switching module, and a day-night switching module. The structure is simple and clear, and is convenient for Use; this method is divided into two modes: short-time switching and day-night switching. These two modes are parallel. For different modes, the average brightness of the region of interest and the average camera exposure are used as characteristics to design the switching method. The method can be applied to various scenarios and has high accuracy.

Description

technical field [0001] The invention relates to the field of driving assistance systems, in particular to a method and device for switching between day and night based on forward collision warning. Background technique [0002] Car rear-end accidents are the most common type of accident. Keeping a sufficient distance from the vehicle in front can reduce the occurrence of rear-end collisions, but the momentary inattention of the driver can still lead to accidents. Studies have shown that 90% of rear-end collisions can be avoided if an early warning signal is issued before a collision occurs. Therefore, the forward collision warning system (Forward Collision Warning) is very important. [0003] FCW usually develops two algorithm modes, daytime and nighttime. In the daytime mode, features such as vehicle shadows or wheels are used, and features such as car lights are used at night. Therefore, it is necessary to switch between day and night to meet the algorithm requirements. ...

AI Technical Summary

Problems solved by technology

The above method is applicable to the traffic monitoring system in the intelligent transportation system, but most of the cameras in the system are fixed positions, and the FCW is loaded on the vehicle. During the actual driving process, various complicated road conditions and weather will be encountered , the brightness trend judgment of a single area of ​​interest will be affected by weather and lights, etc. It is difficult to set the brightness trend judgment threshold. If the setting is too large, it will result in failure to switch, and if it is too small, it will cause wrong switching.

Patent CN 103702038 A uses imaging equipment to switch between day and night. The method sets an adaptive exposure threshold to judge whether to switch between day and night. The threshold adjustment method is that if the current exposure is less than the current threshold, the threshold is set to be between the current exposure and the preset threshold. First of all, it is difficult to determine the preset threshold value. At the same time, when the vehicle is driving at night, due to the influence of the light of the vehicle in front, the exposure will be seriously affected. At night, the exposure will have a smaller value, which will affect the threshold. Automatic adjustment, resulting in switching errors

[0004] Due to the mobility of FCW, vehicles will also enter darker areas during daytime driving, such as tunnels, etc. Therefore, for this characteristic, the present invention designs two switching modes: short-time switching (entering tunnels, etc.), and day and night switching. Avoid the algorithm not switching when entering a dark area, causing the forward collision warning algorithm to fail

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