Method and device for license plate location

Abstract

The invention provides a method for locating a license plate, comprising: dividing the received image into areas to determine a plurality of sub-areas; determining a candidate license plate sub-area in each sub-area based on the character jump feature; merging a plurality of candidate vehicles The license plate area is used to determine the candidate license plate area of ​​the image to be detected; the image-related features of the candidate license plate area are extracted; the candidate license plate area is repositioned based on a predetermined filtering method to determine the license plate area. In the embodiment of the present invention, by dividing the image to be detected into a plurality of sub-regions, and positioning candidate license plate regions based on the sub-regions, the interference of complex backgrounds on license plate positioning is reduced, and the positioning efficiency of the license plate region is improved; at the same time, based on a predetermined filtering method Relocating the candidate license plate area can further filter out the non-license plate area contained in the candidate license plate area, avoiding the problem of misdetecting the traffic guardrail and other interference objects in the image background as the license plate area.

Description

technical field [0001] The invention relates to the field of intelligent transportation, in particular, the invention relates to a method and device for locating a license plate. Background technique [0002] With the rapid development of economy and transportation, motor vehicles have increased significantly, so the monitoring and management of motor vehicles is very important. The license plate is an important sign of a motor vehicle, and the positioning and recognition technology of a motor vehicle license plate (abbreviated as a license plate) is widely used in various occasions such as toll stations and parking lots to realize automatic monitoring and management of motor vehicles, which greatly saves human and material costs. Among them, the license plate location is a key step in the automatic license plate recognition technology, and occupies a very important position in the license plate recognition technology. The recognition rate of license plate recognition ofte...

AI Technical Summary

Problems solved by technology

However, the existing license plate location methods generally have some problems, for example, they are easily disturbed by the background, and when detecting images containing traffic guardrails based on the existing positioning methods, it is easy to mistake the traffic guardrails for license plates, resulting in the real The license plate is missed; as another example, when the existing technology uses horizontal and vertical projection methods to locate the license plate boundary, if the image has an oblique angle, there will be a certain error between the license plate boundary directly projected and positioned and the real license plate, that is, the existing The license plate location method is not robust enough for images with oblique angles.

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