Guangdong and Hong Kong license plate locating method

A license plate location and license plate technology, applied in image data processing, instruments, character and pattern recognition, etc.

Active Publication Date: 2010-06-09
WISESOFT CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Existing technologies are difficult to meet this requirement

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  • Guangdong and Hong Kong license plate locating method
  • Guangdong and Hong Kong license plate locating method
  • Guangdong and Hong Kong license plate locating method

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Embodiment Construction

[0034] The license plate positioning method in Guangdong and Hong Kong includes the following specific implementation steps:

[0035](1) Real-time video capture is carried out through the camera and the acquisition card. In order to obtain an image that is beneficial to the recognition system, the size of the field of view is generally adjusted based on the mainland license plate (because the actual size of the mainland license plate is a unified standard). In the standard 768×576 video image, when the license plate is in the image In the middle position, the pixels occupied by it are 150 pixels, which is the optimal field of view size;

[0036] (2), use the Sobel operator to detect the horizontal edge and the vertical edge respectively, and then use the method of combining the vertical edge with some horizontal edges to detect the edge, as shown in the following formula:

[0037] g V (x,y)=|[f(x-1,y-1)+2f(x-1,y)+f(x-1.y+1)]

[0038] -[f(x+1, y-1)+2f(x+1, y)+f(x+1, ...

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Abstract

The invention relates to a license plate location method for vehicles in Guangdong and Hong Kong, the steps as follows: firstly, capturing a instant video image through the video image pick-up system;secondly, an initial location for the license plates in both mainland and Hong Kong; thirdly, calculating a detectable edge via the edge detection, obtaining a binary image via the segmentation of edge image, then after the filtering, extracting a result map of initial location from the original gray image; fourthly, the license plate location for mainland: adopting a self adaptive thresholding segmentation for the initial location image, obtaining a binary image, and utilizing a characteristic of mainland license plate that continuous variation between black line segment and white line segment, further to reduce the candidate area, and then utilizing the characteristic of height width ratio of mainland license plates, making an accurate location; fifthly, Hong Kong license plate location: adopting a self adaptive thresholding segmentation for the initial location image, then utilizing the relevant characteristics of circumscribed rectangle of the target for exact locating; sixthly, outputting the location results. The invention has the advantages of high accuracy, and capacity of meeting the filed test requirements for customs.

Description

technical field [0001] The invention belongs to the technical field of image processing, in particular to the automatic identification technology of vehicle license plates. Background technique [0002] In recent years, with the development of urban transportation, the application of intelligent transportation systems has become more and more extensive, and the research on intelligent transportation systems has become more and more in-depth. License plate recognition is one of the important technical links. License plate recognition technology can be widely used in expressway automatic toll collection, urban road monitoring, parking lot management, customs automatic registration of passing vehicles, etc., providing great convenience to traffic management departments. With the development of image processing technology, the license plate recognition system has become increasingly mature. See the literature for details: [0003] (1) Shyang-Lih Chang, Li-Shien Chen, Yun-Chun...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K9/46G06T5/00G06K9/32G06K9/00
Inventor 罗以宁蒋欣荣周欣
Owner WISESOFT CO LTD
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