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License plate positioning method based on visual saliency

A technology of license plate positioning and conspicuousness, applied in the field of intelligent transportation, can solve problems such as difficulty in satisfying real-time performance, complex establishment process, poor robustness, etc., and achieve the effects of color fading, good real-time performance, and good versatility

Inactive Publication Date: 2012-11-28
武汉市科迅智能交通设备有限公司 +1
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  • Application Information

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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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  • License plate positioning method based on visual saliency
  • License plate positioning method based on visual saliency
  • License plate positioning method based on visual saliency

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Embodiment Construction

[0046] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0047] see figure 1 , giving a flow diagram of a license plate location method based on visual salience, specifically including:

[0048] Step 1. Generate a saliency map of the vehicle image

[0049] Set the parameters of the visual saliency algorithm GBVS (Graph-based visual saliency): C (color), CW (color weight), I (brightness), IW (brightness weight), R (contrast), RW (contrast weight), O (direction), OW (directional weight), Levels (Gaussian pyramid layer). In this embodiment, C, I, R, O are taken as 1, 0, 1, 0 respectively, indicating that the saliency map only contains color components and contrast components; CW, IW, RW, OW are taken as 2, 0, 1, 0, indicating that the color component in the saliency map accounts for two-thirds of the saliency, while the contrast component accounts for one-third of the salience; Levels take ...

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Abstract

The invention provides a license plate positioning method based on visual saliency, relating to the technical field of intelligent traffic. The license plate positioning method comprises the following steps of extracting a saliency map of a vehicle image; extracting candidate license plate regions; and removing candidate regions which are not accorded with the license plate region conditions through the geometrical characteristics and the textural features of the candidate license plate regions to obtain the license plate region and finish license plate positioning. The license plate positioning method solves the technical problem of providing the license plate positioning method based on the visual saliency, effectively overcomes the dependency of the traditional license plate positioning method on factors such as a license plate size, illumination and a background, is good in robustness and high in recognition accuracy and can be intuitive and simple, and therefore, the requirement of real-time performance of a license plate positioning system can be satisfied.

Description

technical field [0001] The invention relates to the technical field of intelligent transportation, in particular to a license plate location method based on visual salience. Background technique [0002] As an important means of intelligent transportation, license plate recognition technology can recognize the vehicle license number in the image through a series of algorithm operations such as image acquisition, license plate positioning, character segmentation, and character recognition; it uses digital image processing and pattern recognition to collect It can automatically recognize the numbers, letters and Chinese characters of the license plate in real time and accurately, and provide the recognition result in the form of data that can be directly operated by the computer, making the computerized monitoring and management of vehicles a reality. The key to license plate recognition technology lies in the three parts of license plate positioning, character segmentation an...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/32G06K9/54
Inventor 汪国有王然田江敏龚新高
Owner 武汉市科迅智能交通设备有限公司