Gray projection-based license plate character segmentation method

A character segmentation and gray-scale projection technology, applied in the field of computer vision, can solve the problems of increased difficulty in positioning, segmentation, and recognition, loss of color information in the license plate area, and increased difficulty in information utilization, etc., to achieve high efficiency, good recognition, and The effect of high reliability

CN106529540AInactive Publication Date: 2017-03-22HUNAN VISION SPLEND PHOTOELECTRIC TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2017-03-22
Estimated Expiration
Not applicable · inactive patent

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Abstract

The present invention belongs to the computer vision field and relates to a gray projection-based license plate character segmentation method. According to the specific problem of license plate character segmentation, the objective of the invention is to improve the accuracy and reliability of license plate character segmentation and satisfy a requirement for real-time performance. The method includes the following two steps of: 1, removing the license plate borders of an input license plate area image: the upper border and lower border of a license plate are removed, and the left border and right border of the license plate are removed; and 2, segmenting license plate characters. With the method of the invention adopted, difficulties caused by complicated picture background, the influence of whether and illumination, the burring of license plate regions of the license plates of old vehicles and the license plates of illegal vehicles, and the like in an image processing process can be effectively eliminated, and therefore, the high reliability of the reading of license plate characters is high, the recognition of the license plate characters is high, robustness is good, step calculation is simple, high efficiency can be maintained, a requirement for real-time performance can be satisfied, the accuracy of the license plate recognition of a monitoring system is improved, and road traffic and parking lot vehicle management can be greatly promoted.
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Description

Technical field

[0001] The invention relates to the field of computer vision, in particular to a method for segmentation of license plate characters based on gray-scale projection. Background technique

[0002] With the development of modern transportation, people pay more and more attention to the automatic recognition of vehicle license plates. It is one of the important research topics in the field of intelligent transportation in recent years by computer vision and pattern recognition technology. The automatic vehicle license plate recognition system can be used for vehicle management in road toll stations, parking lots, intersections, etc. It plays an important role in promoting road traffic and parking lot vehicle management.

[0003] License plate recognition technology includes three basic links: license plate location, character segmentation, and character recognition. License plate location is the premise of character segmentation and character recognition, and license pl...

Examples

Embodiment Construction

[0056] Taking the gray-scale projection license plate recognition method based on the character segmentation algorithm as an example, the present invention will be further described in detail with reference to the accompanying drawings.

[0057] S1. Remove the license plate frame of the input license plate area image;

[0058] For license plate images, there are two types of license plate images after positioning, one is a license plate with a frame, and the other is a license plate without a frame. After we rotate the license plate candidate area to the level, the license plate can be accurately positioned, that is, the license plate frame is removed. Statistical analysis of the test data shows that there are two types of borders of the license plate candidate area after positioning and rotation, one is the border of the license plate itself, and the other is the white background around the license plate as the candidate license plate area. At this time, the white background can ...