License plate detection and identification method based on maximum stable extremal region

A technology of maximum stable extreme value and extreme value area, which is applied in character and pattern recognition, image data processing, instruments, etc., and can solve problems such as products that cannot be put into use in a large range, stay in a narrow range, etc.

Inactive Publication Date: 2010-10-13
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Although license plate character recognition has made some breakthroughs in technology, there is still a certain gap from the complex and changeable practical application requirements. It has been widely used in the form of products, so the practical research of license plate character recognition still has a long way to go

Method used

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  • License plate detection and identification method based on maximum stable extremal region
  • License plate detection and identification method based on maximum stable extremal region
  • License plate detection and identification method based on maximum stable extremal region

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Embodiment 1

[0084] License plate detection is divided into two stages:

[0085] (1) Learning stage:

[0086] Step 1: First convert the image to be recognized into a grayscale image. Extract the maximum stable extremum area to obtain the candidate license plate text area.

[0087] Step 2: Select a sample:

[0088] The requirement of the training sample is the sub-image surrounded by the smallest rectangle that contains the MSER region. The size of the training samples is normalized to 24×48 pixels, and the ratio of positive examples to negative examples is 1:2. Each sample, especially the negative examples, is different and each has a certain representativeness;

[0089] Step 3: Design a group of Gabor filters to extract the texture features of the sub-image, the specific method is:

[0090] 1) A Gabor filter bank comprising 5 scales (u=0, 1, 2, 3, 4) and 8 directions (v=0, 1, ..., 7) is adopted, and there are 40 filters in total, each Each filter has a size of 32×32. The dimensional...

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Abstract

The invention belongs to the technical field of the pattern identification and image processing, and relates to a license plate detection and identification method based on the maximum stable extremal region, which comprises the following steps: extracting the maximum stable extremal region (MSER) to obtain text regions of candidate license plates; adopting one effective feature for description of each extremal region, classifying the extremal regions into 'text' regions and 'non-text' regions with a classifier obtained in prior training, and extracting a license plate from original images based on the characteristics of the structure of the license plate; and describing with the characteristics of the shape context, and completing the character identification through template matching. Since the maximum stable extremal region has the affine invariance, high stability and multi-scale features, and the regions are determined only according to the gray value and are not light-sensitive,the license plate detection and identification method with the maximum stable extremal region as the base is applicable to the complex background, and has the advantages of good stability and high identification rate.

Description

technical field [0001] The invention belongs to the technical field of pattern recognition and image processing, and in particular relates to a method for license plate detection and recognition based on the maximum stable extremum region. Background technique [0002] With the increase of the number of cars in various countries in the world, the urban traffic situation has been paid more and more attention by people. How to carry out traffic management effectively has increasingly become the focus of the relevant departments of the governments of various countries. In this case, the automatic detection of vehicles, as a source of information, has been paid more and more attention by people. As an important part of the vehicle detection system, automatic license plate recognition technology plays an important role in traffic monitoring and control. Field automatic safety management, intelligent park management and other fields. At the same time, the method of license plat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/62G06K9/36G06T7/00
Inventor 牛海军杨夙
Owner FUDAN UNIV
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