Multi-character characteristic fused license plate positioning method

A license plate location and license plate technology, applied in character and pattern recognition, instruments, calculations, etc., can solve problems such as difficult to meet real-time requirements, complex establishment process, poor robustness, etc., achieve fast speed, high positioning accuracy, good real-time effect

Inactive Publication Date: 2012-03-14
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

The common disadvantages of these methods are: on the one hand, the establishment process is complicated, the calculation amount is large, and it is difficult to meet the real-time requirements; on the other hand, it is easily restricted by factors such as weather, background, and illumination, and the robustness is not good.

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  • Multi-character characteristic fused license plate positioning method
  • Multi-character characteristic fused license plate positioning method
  • Multi-character characteristic fused license plate positioning method

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Embodiment Construction

[0034] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. Whole method processing flow of the present invention is as figure 1 shown. The specific implementation steps are as follows:

[0035] Step 1. Preprocessing the original vehicle image

[0036] 1. In my country, license plates with white characters on a blue background and license plates with black characters on a yellow background are the most common, and have the largest contrast value on the green component. Therefore, in order to reduce unnecessary color-grayscale conversion operations, only the green component is extracted from the original vehicle image f(x, y) to obtain a grayscale image g(x, y), and the conversion relationship is:

[0037] g(x, y) = f g (x, y) (1)

[0038] Where (x, y) represents the position of the pixel in the image, f g (x, y) represents the green component at (x, y) in the original vehicle image f(x, y).

[0039...

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Abstract

The invention discloses a multi-character characteristic fused license plate positioning method. The method comprises the following steps of: (1) performing color image graying processing on an original vehicle image, storing as a gray image, and then performing binarization processing on the gray image to obtain a binary image of the vehicle image; (2) extracting a license plate candidate region; (3) removing the candidate region which does not meet a license plate region condition through the color characteristic and texture characteristic of the license plate candidate region to obtain a license plate region; and (4) accurately positioning a license plate, and obtaining upper, lower, left and right boundaries of a character region in the license plate by using the gray skip characteristic of characters of the license plate region. In the method, the character characteristic of the license plate region is fully utilized, the defect that the conventional license plate positioning method more depends on the shape characteristic and edge characteristic of a license plate frame is overcome, extremely high positioning accuracy is also guaranteed under the condition of a blurry license plate frame, and a division result more meets an observation result of human eyes. The method is intuitive, simple and fast and has better instantaneity.

Description

Technical field: [0001] The invention relates to a license plate positioning method, in particular to a rapid multi-license plate positioning method that utilizes the visual salient features and texture features of characters in the license plate area, from rough positioning to precise positioning, and is suitable for license plates in urban road intelligent traffic systems identified applications. Background technique: [0002] License Plate Recognition LPR (License Plate Recognition) technology, as an important means of intelligent transportation, can identify the vehicle license plate number within the field of vision through a series of algorithm operations such as image capture, license plate positioning, image processing, character segmentation, and character recognition; it Using digital image processing, pattern recognition and artificial intelligence technology to process the collected car images, it can automatically recognize the numbers, letters and Chinese chara...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/32G06K9/54
Inventor 汪国有王然田江敏
Owner HUAZHONG UNIV OF SCI & TECH
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