License plate correction method and device

A correction method and license plate technology, applied in the field of image processing, can solve the problems of reducing the license plate correction accuracy, unable to obtain an accurate connected domain, etc., and achieve the effect of improving the accuracy

Active Publication Date: 2018-07-03
济南宇视智能科技有限公司
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  • Abstract
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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

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  • License plate correction method and device
  • License plate correction method and device
  • License plate correction method and device

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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

An embodiment of the invention provides a license plate correction method and device. The method comprises the following steps: obtaining a character connected domain of a license plate image, and extracting upper-layer edge points and lower-layer edge points of the character connected domain; obtaining character angle points of the license plate image, and extracting upper character angle pointsand lower character angle points from the character angle points; determining a first point set according to the upper-layer edge points and the upper character angle points, and determining a secondpoint set according to the lower-layer edge points and the lower character angle points; and determining angle of inclination of the license plate image according to the first point set and the secondpoint set, and correcting the license plate image according to the angle of inclination. The angle of inclination is determined based on the first point set and the second point set obtained according to the upper-layer and lower-layer edge points and the upper and lower character angle points; when there is no character connected domain, the angle of inclination is determined based on the upperand lower character angle points; and when the number of character angle points is too many due to background interference, the character angle points can be limited through the upper-layer and lower-layer edge points, so that under different situations, the angle of inclination can be determined accurately, and license plate correction accuracy is improved.

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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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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