Optimized exposure method and device for tailing of license plate

Abstract

The invention discloses an optimized exposure method and an optimized exposure device for the tailing of a license plate. The method comprises the steps of setting a camera to a daytime working mode or a night working mode according to environmental brightness; when the camera works in the daytime working mode, setting a smaller shutter time upper limit value and a smaller gain upper limit value; when the camera works in the night working mode, setting a bigger shutter time upper limit value and a bigger gain upper limit value; when the environmental brightness darkens from bright, firstly improving the shutter time of the camera, and then improving the gain upper limit value of the camera; and when the environmental brightness lights up from dark, firstly reducing the gain upper limit value of the camera, and then reducing the shutter time of the camera. The device provided by the invention comprises the daytime working mode and the night working mode. According to the method and device provided by the invention, the license plate in an image shot by the camera does not have obvious tailing is ensured, and meanwhile the quality of the image shot by the camera at night can be improved.

Description

technical field [0001] The invention belongs to the field of intelligent transportation, and in particular relates to a method and a device for optimized exposure of license plate trailing. Background technique [0002] The camera in the intelligent transportation system needs to capture the vehicle with illegal driving behavior on the lane, and obtain the necessary relevant information of the vehicle from the captured image, such as the license plate number, vehicle model and color, among which the license plate number plays a crucial role. important role. [0003] Due to the particularity of the use of the camera in intelligent transportation, while obtaining the characteristics of the illegal vehicle, it is also necessary to obtain the regulatory behavior trajectory of the illegal vehicle. Therefore, the environment around the vehicle in the camera capture image must have a certain brightness, otherwise the vehicle trajectory will not be able to It can be observed throug...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method and device for optimized exposure of license plate trailing, to solve the obvious increase in the overall picture noise of night capture images caused by the phenomenon of license plate trailing in the prior art, and reduce the identification of license plate numbers degree of question

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