License plate character cutting method based on projection

Abstract

The present invention provides a license plate character cutting method based on projection, belonging to the computer vision and intelligent traffic technology field. The method comprises: the horizontal cutting of a license plate is performed and then the perpendicular cutting of the license plate is performed, when characters in the adhesion condition are subjected to recutting, the cutting width of the selected characters is the average width of the character images without the adhesion condition in the characters obtained through cutting, if there are more than seven character images after the processing of the adhesion condition, the 7 characters closest to the middle position in the license plate image are extracted, and the mistakes of the character identification may be taken caused by stains of two sides of the license plate, so that the character cutting accuracy is greatly improved; and the first Chinese character is subjected to reprocessing, a first Chinese character image is obtained through location again according to the average width of other six characters to prevent the left and right Chinese character components of the Chinese character from the fracture of the character in the middle.

Description

technical field [0001] The invention belongs to the technical fields of computer vision and intelligent transportation, and in particular relates to a method for cutting license plate characters based on projection. Background technique [0002] With the continuous development of the field of intelligent transportation, it is currently necessary to accurately identify license plates in road traffic monitoring, automatic toll collection systems, community vehicle management systems, and safety monitoring. License plate recognition technology generally recognizes each character separately, so it is necessary to accurately cut the license plate characters before recognition. [0003] Currently there are many methods for license plate character cutting, wherein the technical scheme closer to the present invention is: patent (Xu Yijie. Application number: 201310263494.8, title: a grayscale histogram based Figure II valued license plate character segmentation method) proposed a m...

AI Technical Summary

Problems solved by technology

[0004] To sum up, the current method of license plate character segmentation has the following deficiencies: (1) Due to the influence of stains on the license plate, the character segmentation error is caused, and the anti-interference ability is weak; (2) The situation of the license plate character adhesion is not considered, and it is easy to be segmented incorrectly ; (3) For Chinese characters with left and right radicals, it is easy to be divided into two or more characters; (4) The calculation is complex and time-consuming; (5) The position derived from prior knowledge is not accurate, resulting in inaccurate character segmentation

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