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A license plate recognition system and a recognition method

A license plate recognition and license plate technology, which is applied in the field of image recognition, can solve the problems of low recognition efficiency, difficult recognition and blurring of license plate information in dynamic images, and achieve the effect of improving reliability, improving comprehensiveness and accuracy, and improving recognition efficiency.

Inactive Publication Date: 2018-12-28
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, due to the influence of the external environment, the dynamic images captured by the camera will be blurred to varying degrees, such as: overcast, rain, fog, snow, weak light intensity at night, strong light intensity of car headlights and other adverse environmental influences, which can easily lead to dynamic The license plate information in the image is difficult to recognize, and the recognition efficiency of the existing vehicle recognition technology is low

Method used

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  • A license plate recognition system and a recognition method
  • A license plate recognition system and a recognition method
  • A license plate recognition system and a recognition method

Examples

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Embodiment 1

[0053] Embodiment 1: a kind of license plate recognition method, such as figure 1 shown, including the following steps:

[0054] Step 1: image acquisition, acquiring the vehicle image for identifying the vehicle. In this embodiment, the vehicle image of the identified vehicle is captured by the camera device.

[0055] Step 2: Image gradient information extraction, extracting the gradient information of the gray scale change in the vehicle image, and forming a corresponding gradient image according to the gradient information.

[0056] Step 3: gradient image histogram processing, the gradient image histogram is processed, and the contrast of the gradient image is adjusted.

[0057] Step 4: The license plate area is highlighted, and the license plate area in the gradient image is highlighted according to the inherent grayscale change characteristics of the license plate. In this embodiment, the highlighting of the license plate area is achieved by enhancing the contrast of th...

Embodiment 2

[0077] Embodiment 2: a kind of license plate recognition system, such as figure 2 As shown, it includes an image acquisition module 1, an image gradient information extraction module 2, a gradient image histogram processing module 3, a license plate area highlighting module 4, a license plate information recognition module 5 and a license plate information display module 6.

[0078] The image acquisition module 1 is connected in communication with the image gradient information extraction module 2 , and is used to acquire the vehicle image for identifying the vehicle, and transmit the vehicle image to the image gradient information extraction module 2 .

[0079] The image gradient information extraction module 2 communicates with the gradient image histogram processing module 3, and is used to extract the gradient information of the grayscale change in the vehicle image, form a corresponding gradient image according to the gradient information, and transmit the gradient image ...

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Abstract

A license plate recognition system and a recognition method are disclosed, the invention relates to the field of image recognition technology, which solves the problem that the dynamic image capturedby the camera will be blurred in different degrees due to the influence of the external environment, and the license plate information in the dynamic image is difficult to be recognized. The technicalscheme essentials are as follows: obtaining the vehicle image of the recognized vehicle; extracting gradient information of gray change in the vehicle image and forming a corresponding gradient imageaccording to the gradient information; processing the histogram of the gradient image and adjusting the contrast of the gradient image; highlighting a license plate area in the gradient image according to an inherent gray change characteristic of the license plate; identifying vehicle information in the vehicle area according to an inherent geometric feature of a license plate. The vehicle information is presented by a display device, and the license plate information can be recognized quickly and accurately under the influence of adverse environment, and the recognition efficiency of the license plate information is improved.

Description

technical field [0001] The invention relates to the technical field of image recognition, more specifically, it relates to a license plate recognition system and a recognition method. Background technique [0002] License plate recognition technology plays a very important role in today's era of development. At present, it has been widely used in the field of intelligent transportation, such as traffic light intersections, parking lots, public security checkpoints and other places. [0003] At present, vehicle recognition generally uses a camera to capture the dynamic image of the car, and then recognizes the license plate information in the captured image; the license plate information recognition technology generally involves image processing and image restoration, and image processing includes grayscale transformation, histogram processing and filtering. [0004] However, due to the influence of the external environment, the dynamic images captured by the camera will be ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/32G06K9/46G06K9/36
CPCG06V20/63G06V10/20G06V10/56G06V20/625
Inventor 孙兴波
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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