License plate positioning method and device and storage medium

Abstract

The invention discloses a license plate positioning method and device and a storage medium, and belongs to the technical field of image processing. The method comprises the following steps of: obtaining a shot image and carrying out gray processing on the shot image; obtaining grayscale images, wherein the shot image comprises a license plate to be positioned; based on gray values of K rows of pixel points included in the gray image, determining L effective sections in the grayscale image, the L effective sections being used for indicating positions where the license plate possibly exists in the photographed image, the K and the L being positive integers, and the L being less than or equal to the K; and positioning the license plate from the photographed image based on the L effective sections in the grayscale image. Thus, when the characters of the license plate are irregularly distributed, the problem of inaccurate license plate positioning caused by the fact that the license plate needs to be positioned in a connected domain detection mode is avoided, and the positioning accuracy is improved.

Description

technical field [0001] The present application relates to the technical field of image processing, in particular to a license plate location method, device and storage medium. Background technique [0002] In daily life, the license plate is used as the ID card of the car, and is widely used in parking lots, electronic toll stations and other scenarios. In practical application scenarios, the license plate can usually be photographed and automatically recognized by equipment such as a computer to obtain license plate information. Among them, the recognition process mainly includes several processes of license plate location, text segmentation, and text recognition. It can be seen that license plate location is one of the important links to realize license plate recognition. [0003] In the related technology, the connected domain detection method is usually used to realize the license plate location. The realization process mainly includes: binarizing the captured image ob...

AI Technical Summary

Problems solved by technology

[0004] In the process of implementing the present application, the inventor found that the prior art has at least the following problems: because the characters of license plates in some countries are distributed irregularly, for example, there is a large distance between the first character and the second character, the When , the distance between the two connected domains corresponding to the detected first character and the second character is greater than the set distance, so the detection will stop

But in fact, the connected domains corresponding to the second character and the following characters also belong to the area where the license plate is located. It can be seen that when the license plate is located by the connected domain detection method, the accuracy of license plate positioning is likely to decrease.

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