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Calibration method and device for license plate

A correction method and license plate technology, applied in the field of image processing, can solve the problems of reducing the accuracy of license plate correction and failing to obtain accurate connected domains, and achieve the effect of improving accuracy

Active Publication Date: 2021-12-28
济南宇视智能科技有限公司
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  • Abstract
  • Description
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Problems solved by technology

[0004] In view of this, the present application provides a method and device for correcting a license plate to solve the problem that the existing correction method cannot obtain accurate connected domains, thereby reducing the accuracy of license plate correction

Method used

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  • Calibration method and device for license plate
  • Calibration method and device for license plate
  • Calibration method and device for license plate

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Embodiment Construction

[0031] Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with aspects of the present application as recited in the appended claims.

[0032] The terminology used in this application is for the purpose of describing particular embodiments only, and is not intended to limit the application. As used in this application and the appended claims, the singular forms "a", "the", and "the" are intended to include the plural forms as well, unless the context clearly dictates otherwise. It should also be understood that the term...

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Abstract

The application provides a license plate correction method and device, the method comprising: obtaining the character connected domain of the license plate image, extracting the upper edge points and lower layer edge points of the character connected domain; obtaining the character corner points of the license plate image, extracting Upper-level character corner points and lower-level character corner points; determine the first point set according to the upper-level edge points and upper-level character corner points, and determine the second point set according to the lower-level edge points and lower-level character corner points; according to the first point set and the second point set Determine the tilt angle of the license plate image, and use the tilt angle to correct the license plate image. This application determines the inclination angle according to the first point set and the second point set obtained by the upper and lower layer edge points and the upper and lower layer character corner points, and determines the inclination angle according to the upper and lower layer character corner points when there is no character connected domain, and the background interference causes the character When there are many corner points, the upper and lower layer edge points are used to limit the character corner points, so in different situations, the inclination angle can be accurately determined, thereby improving the accuracy of license plate correction.

Description

technical field [0001] The present application relates to the technical field of image processing, in particular to a method and device for correcting a license plate. Background technique [0002] License plate recognition usually includes image acquisition, license plate location, character segmentation, and recognition processing steps. However, due to shooting angles and other reasons, the license plate in the image will appear tilted, which will lead to the problem that the connection between the license plate characters is destroyed, thus Reduce license plate recognition rate. [0003] In the related technology, the preprocessed license plate image is binarized by an edge detection operator, and the binarized image is subjected to multiple morphological operations using a structural element template to obtain connected domains, and then the least squares method is used to All target points in the connected domain are fitted, and finally the tilt angle is obtained. In...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K9/32
CPCG06V30/1478G06V20/625
Inventor 王芬芬张武丽谢钱昆罗维
Owner 济南宇视智能科技有限公司
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