Number plate identification method and identification system thereof

A technology for license plate recognition and character recognition, which is applied in the field of vehicle recognition and can solve problems such as low recognition rate

Inactive Publication Date: 2012-06-20
ZHUHAI YEARING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] In order to solve the problem of low recognition rate of existing license plate recognition technology under complex environmental factors, the purpose of the present invention is to provide a high-precision license plate recognition method and a corresponding license plate recognition system

Method used

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  • Number plate identification method and identification system thereof
  • Number plate identification method and identification system thereof
  • Number plate identification method and identification system thereof

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Experimental program
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Embodiment 1

[0080] Such as figure 1 and 2 As shown, the present invention discloses a license plate recognition method, and its general idea still includes the following three steps:

[0081] S1: license plate image positioning;

[0082] S2: character segmentation;

[0083] S3: character recognition.

[0084] 1. License plate image positioning

[0085] The invention can use the license plate positioning method based on mathematical morphology, and utilize the color information of the license plate to assist in the positioning of the license plate. This positioning method comprehensively considers the grayscale, edge and color information of the license plate image, and the realization process is as follows: image 3 , the specific positioning implementation process is as follows:

[0086] 1) The license plate image is preprocessed, such as grayscale transformation, denoising, contrast enhancement, edge detection, binarization and other methods, which improve the quality of the image...

Embodiment 2

[0234] This embodiment discloses a license plate recognition system corresponding to Embodiment 1, including a license plate image positioning unit, a character segmentation unit, and a character recognition unit. The character recognition unit specifically includes the following subunits:

[0235] The preprocessing subunit removes the redundant frame of the single character image after the character segmentation process, and converts each character graphic into pixels of the same size;

[0236] The rough classification subunit divides each character image into two categories, the first category is Chinese character images, and the second category is letter and number images;

[0237] The Chinese character recognition sub-unit, the first class utilizes the Gabor filter to extract the image features of each Chinese character image, and utilizes the minimum distance classifier to realize classification according to its image features;

[0238] Number and letter recognition subun...

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Abstract

The invention belongs to the technical field of vehicle identification and particularly discloses a number plate identification method and an identification system of the number plate identification method. The method comprises the steps of number plate image positioning, character separation and character identification, wherein the character identification step comprises pre-treatment, coarse classification, Chinese character identification and number and letter identification. Through the improvement on a Chinese character identification method (through a Gabor filter and a minimum distance classifier) and a number and letter identification method (based on correlation feature selection (CFS) and a Bayes classifier), the number plate Chinese character identification rate and the number plate number and letter identification rate are greatly improved.

Description

technical field [0001] The invention belongs to the technical field of vehicle recognition, and in particular relates to a high-precision license plate recognition method and a recognition system for Chinese license plates. Background technique [0002] There are mainly four types of license plates in my country: white characters on a blue background, black characters on a yellow background, black characters on a white background, red characters on a black background, and white characters on a black background. They include seven characters in Chinese, English, and numbers. Chinese characters are usually located at the beginning and end of the license plate, and the middle five characters are usually numbers or letters. [0003] License plate recognition technology is an important part of automatic vehicle recognition technology. It mainly uses the idea that each car has a unique license plate number so that different vehicles have different license plates to identify and co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/62
Inventor 蔡宏民
Owner ZHUHAI YEARING TECH
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