A capture optimization method and device under shadow occlusion

Abstract

The invention discloses a snapshot optimization method and device under shadow occlusion. The method first obtains the brightness distribution of a target detection area according to a live frame, and judges the shadow occlusion of the target detection area; then, according to the shadow occlusion of the target detection area, and the capture position, estimate the target brightness corresponding to the capture frame; finally, adjust the exposure parameters of the capture frame according to the estimated target brightness corresponding to the capture frame and the target desired brightness. The device of the present invention includes a judging module, an estimating module and an adjusting module. The method and device of the present invention solve the problem in the prior art that some license plates are over-exposed or under-exposed when there are shadows. Improved the rendering effect of captured vehicle license plates, and improved the license plate recognition rate.

Description

technical field [0001] The invention belongs to the field of video monitoring, and in particular relates to a method and device for optimizing snapshots under shadow occlusion. Background technique [0002] At present, a large number of parks have set up gate toll stations to charge reasonable fees for parked vehicles in the park. The toll system involves entrance and exit cameras, pole lift control systems, and vehicle information management platforms. The entrance and exit cameras are mainly responsible for vehicle capture and license plate information collection. In order to ensure the capture rate of passing vehicles, the entrance and exit cameras mostly use coils laid on the ground to achieve capture and trigger, and the license plate information recognition is completed by the entrance and exit cameras. It is closely related to the license plate presentation of the captured image, and the recognition rate of an appropriately exposed license plate will be significantly ...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method and device for optimizing snapshots under shadow occlusion, so as to solve the problem that the camera cannot judge whether the current scene is strong or not when there is not enough continuous passing vehicles for license plate brightness statistics in the prior art. Backlight or shadow environment, so that the camera cannot adjust the exposure correctly, resulting in overexposure or underexposure of the license plate, and when the camera can adjust the exposure correctly, some license plates are still overexposed or underexposed before the camera adjusts the exposure The problem

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