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Complex background license plate recognition method

A license plate recognition, complex background technology, applied in character recognition, character and pattern recognition, instruments, etc., can solve the problems of slow recognition speed and inability to meet real-time requirements, and achieve good robustness, accuracy, and good universality Effect

Inactive Publication Date: 2018-09-14
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If a system has a very high recognition rate, but the recognition speed is slow and takes a few seconds or even a few minutes, then this system will have no practical significance, because it cannot meet the real-time requirements in practical applications.

Method used

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  • Complex background license plate recognition method
  • Complex background license plate recognition method
  • Complex background license plate recognition method

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Embodiment Construction

[0032] In order to better understand the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments do not limit the protection scope of the present invention.

[0033] Such as figure 1 As shown, a complex background license plate recognition method, including the following steps:

[0034] S01, multi-scale zoom image; first, the source image of the license plate is zoomed in different proportions according to the image pyramid, and the zoom ratio is 30%, 45%, 70%, 100%, 150%, 225%, 300%; a series of License plate images with different scaling ratios (here the resize of matlab is used for scaling). In the actual application environment, because the distance between the vehicle and the acquisition device is different, the proportion of the license plate area in the acquired image may also be different, in order to support the positioning of license plate images o...

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Abstract

The invention discloses a complex background license plate recognition method. According to the method, an original image to be recognized acts as a license plate source image, the license plate source image is scaled according to multiple proportions of 30%-300%, and then initial locating is performed on the scaled images; then whether the license plate area of the sub-images is inclined is detected and correction is performed; the license plate characters are segmented out of the license plate sub-images through a license plate character segmentation algorithm; and the license plate characters are recognized through a license plate character recognition algorithm and the recognition result is outputted. According to the method, different scales of license plate recognition can be supported, and great recognition can be performed under the condition of poor license plate image quality, uneven illumination and license plate pollution so that the reliability and the accuracy are high, the universality is great and the license plates acquired under various environments can be recognized.

Description

technical field [0001] The invention relates to a license plate recognition method, in particular to a license plate recognition method with a complex background, and belongs to the technical field of intelligent transportation. Background technique [0002] License plate recognition is an important research topic in the field of intelligent transportation. The license plate recognition system is a comprehensive application technology in many fields such as image processing, machine vision, pattern recognition, and information theory. The role of the license plate recognition system is to automatically locate the license plate image from the source image, automatically perform tilt correction and image enhancement on the obtained license plate image, and then perform positioning and segmentation of the license plate characters on this basis, and finally recognize the character image , to output the content of the license plate in the form of text. In addition, the license ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00G06K9/32G06K9/34G06K9/46G06K9/62G06N3/04
CPCG06V20/54G06V10/242G06V10/255G06V20/63G06V10/267G06V10/44G06V20/625G06V30/10G06N3/048G06F18/22
Inventor 李拥军张恒贺亮亮
Owner SOUTH CHINA UNIV OF TECH
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