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Method for recognizing characters of number plate images of armed police automobiles

A character recognition and character technology, which is applied in the field of character recognition of armed police car license plate images, can solve the problems of small size and inability to cut, achieve accurate recognition, improve speed and accuracy

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

like figure 1 As shown, the police logo "WJ" in the license plate of the armed police car is glued together, and the "W" and "J" cannot be effectively cut off on the license plate image; secondly, the jurisdiction code "01" on the license plate image of the armed police car is actually The image size is extremely small, and it is difficult to further cut the jurisdiction code "01" on the license plate image

Method used

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  • Method for recognizing characters of number plate images of armed police automobiles
  • Method for recognizing characters of number plate images of armed police automobiles
  • Method for recognizing characters of number plate images of armed police automobiles

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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 As shown, it is an 8-bit grayscale image of the license plate of the armed police car. The "W" and "J" marks of the police type on the image of the license plate of the armed police car are glued together, and the actual image size of the jurisdiction code on the image of the license plate of the armed police car is extremely small, making it difficult to accurately identify. According to the method of the present invention, the glued "W" and "J" are reconstructed into the character "WJ", and the code of the jurisdiction area with a particularly small image size and sometimes blurred on the small license plate is reconstructed into a character, That is, the area codes 00-34 are reconstructed into new characters "00"-"34", and then the police type signs and area codes in the license plate of the Armed Police are accurately identified according to...

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Abstract

The invention relates to a method for recognizing characters of number plate images of armed police automobiles. The method comprises the following steps: converting number plate color images of the armed police automobiles into gray level images; performing binaryzation and character segmentation; reconstructing adhered police marks WJ of license plates of the armed police automobiles into characters 'WJ', and reconstructing administrative district codes from 00 to 34 with small dimension on license plate images into novel characters from '00' to '34'; performing trimetric projection on binarized 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 does not perform character segmentation on the insides of the police marks and the administrative district codes on the number plate images of the armed police automobiles, so that the method not only is not influenced by adhered characters in the police marks but also can consider the recognition of the administrative district codes on the license plates of armed police compact automobiles, and improves the speed and the precision of character recognition of the license plates of the armed police automobiles.

Description

technical field [0001] The invention relates to a recognition method of deformed license plate characters of an armed police car number plate image, in particular to a character recognition method of an armed police car number plate image based on character reconstruction. Background technique [0002] In May 2007, the Armed Police Force officially replaced the "2007-style" license plate. The composition of the new Armed Police license plate broke the traditional pattern. Completely distinguish the number plate from the large vehicle number plate; the police type mark is changed from Chinese characters to pinyin letters (WJ); the jurisdiction code on the small car number plate is placed under the pattern of the armed police; The vehicle unit codes of troops, frontier defense, firefighting, and security forces (border inspection stations, prefecture and city security offices) are composed of 26 English letters, and the sequence adopts the start and end arrangement of the vehi...

Claims

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Application Information

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IPC IPC(8): G06K9/00G06K9/54
Inventor 姜良维马庆方艾芬方丽庄
Owner TRAFFIC MANAGEMENT RES INST OF THE MIN OF PUBLIC SECURITY
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