Guangdong and Hong Kong license plate locating method

A technology of license plate location and two places, which is applied in image data processing, instruments, character and pattern recognition, etc.

Active Publication Date: 2008-05-21
WISESOFT CO LTD
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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, y...

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Abstract

A method for locating license plates in Guangdong and Hong Kong, the steps are as follows: capture sudden video images through a video camera system; initial positioning of license plates in mainland China and Hong Kong; detectable edges through edge detection, segment the edge image to obtain a binary image, and then After filtering, extract the initial positioning result image from the original grayscale image; Continental license plate positioning: Segment the initial positioning image with an adaptive threshold segmentation method to obtain a binary image, and then use the continuous black and white line segment jump of the Continental license plate feature, further narrow down the candidate area, and then use the aspect ratio feature of the mainland license plate to perform precise positioning; Hong Kong license plate positioning: use the adaptive threshold segmentation method to segment the initial positioning image, and then use the relevant features of the target circumscribed rectangle to accurately position; output positioning result. The positioning accuracy of the present invention is high, and can meet the on-site inspection requirements of the 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 Applications(China)
IPC IPC(8): G06K9/00G06K9/32G06T5/00G06K9/46
Inventor 罗以宁蒋欣荣周欣
Owner WISESOFT CO LTD
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