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License plate recognition method based on mixed feature and gray projection

A technology of gray-scale projection and mixed features, applied in the field of computer vision, can solve problems such as complex picture background, uneven illumination, and difficult license plate recognition, and achieve accurate positioning and good segmentation effects

Inactive Publication Date: 2017-03-22
HUNAN VISION SPLEND PHOTOELECTRIC TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The difference is that the pictures collected at intersections have complex backgrounds, uneven lighting, low resolution, old license plates, dirty license plates, etc., all of which have brought great difficulties to license plate recognition. For these specific practical problems, The invention proposes a license plate automatic positioning, segmentation and recognition method

Method used

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  • License plate recognition method based on mixed feature and gray projection
  • License plate recognition method based on mixed feature and gray projection
  • License plate recognition method based on mixed feature and gray projection

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Embodiment Construction

[0069] Taking the license plate recognition system based on mixed features and grayscale projection as an example, the present invention will be further described in detail in conjunction with the accompanying drawings.

[0070] This embodiment is a license plate recognition method based on mixed features and grayscale projection, which specifically includes the following steps S1 to S3.

[0071] S1. License plate positioning;

[0072] S1.1 Color space conversion

[0073] Generally, the color images obtained by CCD cameras or digital cameras are based on the RGB model, which mixes the three colors of red (R), green (G), and blue (B) according to addition to obtain most of the colors that the human eye can see. But the RGB model is not suitable for people to visually identify and judge the color information, and it is difficult for computers to process it. The HSI color model starts from human vision and uses hue (H), saturation (S) and brightness (I) to describe colors. It ...

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Abstract

The invention relates to the field of computer vision and particularly relates to a license plate recognition method based on mixed feature and gray projection. For the specific problem of license plate recognition, the invention aims to improve the accuracy and reliability of a system, and a real-time requirement can be satisfied. The method comprises the steps of (1) license plate positioning based on mixed characteristics, (2) license plate character segmentation, and the license plate character segmentation based on an improved gray projection algorithm, and (3) character recognition and output after the license plate character segmentation. The characteristics of a combined direction gradient histogram and a kernel principal component analysis method are put forward, the advantages of the direction gradient histograms of a binary image, a grayscale image and a 16-value image are integrated, and the structural features of a Chinese character can be extracted. The method provided by the invention can be embedded into an FPGA to realize actually and is applied to a camera or video camera with a real-time image output function and a license plate positioning and recognition function.

Description

technical field [0001] The invention relates to the field of computer vision, in particular to a license plate recognition method based on mixed features and grayscale projection. Background technique [0002] With the development of modern transportation, automatic vehicle license plate recognition technology has been paid more and more attention, and it is one of the important research topics of computer vision and pattern recognition technology in the field of intelligent transportation in recent years. The automatic vehicle license plate recognition system can be used for vehicle management in highway toll stations, parking lots, intersections and other places, and plays an important role in promoting road traffic and parking lot vehicle management. [0003] License plate recognition technology includes three basic links of license plate location, character segmentation and character recognition, among which license plate location is the premise of character segmentation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/62G06K9/46G06K9/34G06K9/20
CPCG06V10/22G06V10/267G06V10/48G06V10/56G06V10/462G06V20/625G06F18/2411
Inventor 张斯尧马昊辰
Owner HUNAN VISION SPLEND PHOTOELECTRIC TECH
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