Method for recognizing characters of number plate images of motor vehicles based on trimetric projection

A three-dimensional projection, character recognition technology, applied in character and pattern recognition, computer parts, instruments, etc., can solve the problems of irregular characters, deformation, affecting the accuracy of motor vehicle license plate image recognition, etc., to improve the accuracy. Effect

Inactive Publication Date: 2009-10-28
TRAFFIC MANAGEMENT RES INST OF THE MIN OF PUBLIC SECURITY
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Problems solved by technology

However, because the video images of motor vehicle traffic violations are easily affected by factors such as installation conditions and operating environment, the captured video images often have defects, especially the irregular or deformed characters on the license plate have become the automatic identification of motor vehicle license plate images. One of the technical difficulties, which seriously affects the improvement of the accuracy of motor vehicle license plate image recognition

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  • Method for recognizing characters of number plate images of motor vehicles based on trimetric projection
  • Method for recognizing characters of number plate images of motor vehicles based on trimetric projection
  • Method for recognizing characters of number plate images of motor vehicles based on trimetric projection

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with drawings and embodiments.

[0021] Such as figure 1 Shown is the grayscale image of the motor vehicle license plate image, the characters on the image are already very blurred, especially the Chinese characters on the license plate can no longer distinguish the strokes of Chinese characters, and the adhesion between the characters is very serious, which brings difficulties for accurate automatic character recognition. Here comes the difficulty. However, according to the recognition method of the present invention, the blurred character binary image is three-dimensionally projected in the left-right (horizontal) direction, up-down (vertical) direction, and space overlooking direction, thereby calculating and forming the character feature value to be recognized , and then quickly match the feature value of the character to be recognized with the feature value of the standard character, so as to acc...

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Abstract

The invention relates to a method for recognizing deformed license plate characters of number plate images of motor vehicles. The method comprises the following steps: converting number plate color images of the motor vehicles into gray level images; performing binaryzation and character segmentation; performing trimetric projection on fuzzy binarized character images in the horizontal direction, the vertical direction and the spatial overlooking direction; forming character characteristic values through calculation; and quickly matching the character characteristic values with character characteristic values in a standard word stock so as to accurately recognize fuzzy characters. The method has the advantages that: the method can quickly match the deformed characters of the number plate images of the motor vehicles, and is used for quick and fuzzy recognition of the deformed number plate characters in the process of automatic recognition of the number plate images of the motor vehicles so as to automatically extract number of number plates of the motor vehicles for images recorded by a video image monitoring device for monitoring illegal traffic activities of the motor vehicles.

Description

technical field [0001] The invention relates to a recognition method of license plate deformed characters of a motor vehicle number plate image, in particular to a character recognition method based on three-dimensional projection. Background technique [0002] According to statistics, motor vehicle traffic violations are one of the root causes of high road traffic accidents. For this reason, the traffic management departments of public security organs in various places have installed a large amount of video image monitoring equipment for illegal motor vehicle traffic on the roads under their jurisdiction for banning or stopping motor vehicle traffic violations. However, with the rapid growth of road mileage and motor vehicle ownership, the number of video monitoring equipment installed for motor vehicle traffic violations has increased sharply. Disposal has become a hot issue for complaints from the general public. Configuring the automatic recognition function of motor ve...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00G06K9/54
Inventor 姜良维蔡晨刘太国莫子兴
Owner TRAFFIC MANAGEMENT RES INST OF THE MIN OF PUBLIC SECURITY
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