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License number matching algorithm based on digital image processing

A license plate number and matching algorithm technology, applied in the field of image recognition, can solve the problems of feature matching and detection difficulties, and achieve the effect of good stability, robustness and accurate matching.

Inactive Publication Date: 2013-04-24
UNIV OF SHANGHAI FOR SCI & TECH
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Problems solved by technology

[0003] The present invention is aimed at the problem that both feature matching and detection are difficult, and proposes a license plate number matching algorithm based on digital image processing, which completes the feature point extraction of the algorithm and completes the matching of two images

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  • License number matching algorithm based on digital image processing
  • License number matching algorithm based on digital image processing
  • License number matching algorithm based on digital image processing

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Embodiment Construction

[0027] Figure 1 shows the flow chart of the license plate number matching algorithm based on digital image processing, including image information collection, feature extraction of to-be-matched and reference images, image feature matching, and experimental verification results. The image information acquisition is to take the image taken by the shooting equipment as the experimental object. Here, two shots are taken on the same license plate to obtain two images, one is set as the image to be matched, and the other is used as the reference image; the feature extraction of the two experimental images Analyze and extract feature information; image feature matching is to perform similarity matching on the features of the extracted two images; finally, research from different thresholds, different dimensions, and different rotation angles, through specific The experimental results verify the excellent characteristics of the algorithm.

[0028] 1. The feature extraction method inc...

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Abstract

The invention relates to a license number matching algorithm based on digital image processing. The license number matching algorithm based on the digital image processing comprises the following steps of: twice shooting a same license through shooting equipment to obtain two images, and carrying out scale space extreme value detection, accurate characteristic point position positioning, characteristic point principal direction determination and characteristic vector generation on the two images to obtain image characteristics; and then matching the characteristic vectors of the two images. The license number matching algorithm based on the digital image processing, which is disclosed by the invention, can still complete the matching and keep good stability and robustness under the conditions of scaling, rotation, brightness variation, affine transformation and noise influence through a particular experiment verification algorithm and is suitable for carrying out fast and accurate matching in a great number of characteristic databases.

Description

technical field [0001] The invention relates to an image recognition technology, in particular to a license plate number matching algorithm based on digital image processing. Background technique [0002] At present, relevant researchers have done a lot of research on image matching technology, and proposed many matching algorithms: there are methods based on area, methods based on ratio, and phase correlation algorithms, etc., but these matching algorithms have one thing in common: image The focal length between them must be consistent, there should be no scaling, the rotation should not be too large, the deformation should not be too obvious, and there are restrictions on lighting changes, radiation transformations, and so on. With the development of image technology and computer technology, feature-based image matching technology appears. The advantage of this technique is that it can handle images with different characteristics and complex deformation between images. T...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00G06K9/46
Inventor 丛媛陈晓荣刘晓东秦兴盛
Owner UNIV OF SHANGHAI FOR SCI & TECH
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