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License plate inclination correction method

A tilt correction, license plate technology, applied in the field of computer vision and intelligent transportation, can solve the problems of high dependence on license plate frame, low efficiency, weak anti-interference ability, etc.

Active Publication Date: 2017-05-31
ZHEJIANG HAOTENG ELECTRONICS POLYTRON TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] To sum up, the current license plate tilt correction method has the following deficiencies: (1) The dependence on the license plate frame is relatively large, and the lack of license plate frame is easy to detect errors; (2) The calculation is large and the efficiency is low; (3) The license plate The characters are sticky, the situation with stains is more sensitive, and the anti-interference ability is weak

Method used

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Embodiment Construction

[0101] The specific implementation of the method for rectifying the license plate inclination of the present invention will be described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0102] As shown in the figure, a method for rectifying the inclination of the license plate of the present invention includes the following steps:

[0103] Step 1: Binarize the license plate image to obtain a binarized image, such as figure 1 shown;

[0104] Step 2: Extract the specified part from the binarized image obtained in step 1 to form a new image newImage, such as Figure 4 As shown, the specific steps are as follows:

[0105] Step 2.1: Create a blank image with a white background as newImage, the image width is equal to width, and the image height is equal to three quarters of the height; where width is t...

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Abstract

The invention discloses a license plate inclination correction method and belongs to the field of computer vision and intelligent transportation technology. The license plate inclination correction method is a new inclination correction method proposed for solving the problem that inclination of a license plate may disturb license plate character segmentation and character recognition. According to the method, an inclination angle is determined according to a projection value mean square error of the license plate, projection value information is well utilized, projection values of a license plate image in different directions are calculated by changing the angle theta, a horizontal and vertical correction mode is adopted, and it is not to calculate projection values of an original image when the inclination angle is calculated but to extract parts of the original image to form new small images for operation. Therefore, a large calculation amount can be reduced, efficiency is also greatly improved, and correctness of inclination angle detection is improved to a certain extent.

Description

technical field [0001] The invention belongs to the technical fields of computer vision and intelligent transportation, and in particular relates to a license plate tilt correction method capable of performing horizontal tilt correction and vertical tilt correction on the license plate. Background technique [0002] With the continuous development of the field of intelligent transportation, it is currently necessary to accurately identify license plates in road traffic monitoring, automatic toll collection systems, community vehicle management systems, and safety monitoring. Due to the relationship between the position and angle of the camera, the license plate in the captured vehicle photos is likely to be tilted horizontally or vertically, which will cause trouble for subsequent license plate character cutting and recognition. The license plate obtained by positioning is corrected. [0003] There are also many methods currently used to correct the inclined license plate, ...

Claims

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Application Information

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IPC IPC(8): G06T3/60G06T7/13
CPCG06T3/608G06T2207/30248
Inventor 高飞汪敏倩吴宗林
Owner ZHEJIANG HAOTENG ELECTRONICS POLYTRON TECH INC
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