Automatic license plate character recognition method

An automatic recognition and license plate technology, applied in the field of computer vision and pattern recognition, to achieve the effect of improving the performance

Inactive Publication Date: 2013-05-22
HOHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] With the expansion of the city, the number of motor vehicles in the city has increase

Method used

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  • Automatic license plate character recognition method
  • Automatic license plate character recognition method
  • Automatic license plate character recognition method

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Embodiment Construction

[0055] Below in conjunction with the accompanying drawings and specific embodiments, the present invention will be further clarified. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. Modifications of equivalent forms all fall within the scope defined by the appended claims of this application.

[0056] like figure 1 As shown in the figure, the automatic license plate character recognition method of the present invention first converts the image or video screenshot captured by the camera into a digital image and input it into the computer (step 101), then preprocesses the input image (step 102), and then according to different lighting conditions , using different methods to locate the position of the license plate (step 103); next, the tilt correction of the license plate image is realized by digital image processing methods such as binarization, horizontal tilt correction and ...

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Abstract

The invention discloses an automatic license plate character recognition method. The method includes following steps: inputting color vehicle images; pretreating the images; choosing different algorithms for license plate positioning under different light conditions; subjecting a license plate to horizontal tilt correction and vertical tilt correction; adopting a method based on cluster connection and vertical projection to perform character segmentation to the license plate obtained in step d; using an improved template matching method to perform character recognition to characters obtained in step e; and outputting recognition results of step f. By the automatic license plate character recognition method, using performance of a whole automatic license plate character recognition system is evidently improved, in the step of license plate positioning, license plate positioning can be realized by choosing different algorithms under different light conditions and utilizing characteristics of license plate areas, and accurate positioning of license plate area positions can be guaranteed even under the circumstance that interferences occur.

Description

technical field [0001] The invention belongs to the field of computer vision and pattern recognition, relates to pattern recognition, digital image processing, artificial intelligence, computer science and other disciplines, and specifically relates to an automatic recognition method for license plate characters. Background technique [0002] With the expansion of the city scale, the number of motor vehicles in the city has increased rapidly, and the traditional manual management of traffic has been unable to adapt to this change. Therefore, intelligent transportation systems are widely used in urban traffic management and scheduling. Among them, the license plate recognition (Vehicle License Plate Recognition, VLPR) is the core of the intelligent transportation system. [0003] License plate recognition is an important part of modern intelligent transportation system and is widely used. It is based on techniques such as pattern recognition, computer vision, and digital im...

Claims

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Application Information

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IPC IPC(8): G06K9/20G06K9/54
Inventor 王敏
Owner HOHAI UNIV
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