Snap photography optimization method and device under shadow shading

Abstract

The invention discloses a snap photography optimization method and device under shadow shading. The method comprises the following steps: firstly, according to a live frame, obtaining the luminance distribution situation of a target detection area, and judging the shadow shading situation of the target detection area; then, according to the shadow shading situation of the target detection area and a snap photography position, estimating target luminance corresponding to a snap photography frame; and finally, according to the target luminance and the target expected luminance corresponding to the estimated snap photography frame, regulating the exposure parameter of the snap photography frame. The device comprises a judgment module, an estimation module and a regulation module. By use of the method and the device, the problem in the prior art that parts of license plates are subjected to overexposure or underexposure when shadow shading is in the presence is solved, the license plate presenting effect of a snap photography vehicle is improved, and a license plate identification rate is improved.

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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