License plate sloped correcting method based on supporting vector machines

A support vector machine and tilt correction technology, applied in the field of intelligent recognition, can solve the problems of large amount of calculation and low accuracy, and achieve the effects of simplifying calculation, improving algorithm efficiency, and avoiding randomness and instability
CN101118596AInactive Publication Date: 2008-02-06XIAN UNIV OF TECH
0 Cites 11 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
XIAN UNIV OF TECH
Publication Date
2008-02-06
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The present invention discloses a correcting method for the inclination of a vehicle license based on a supporting vector machine. The implementing steps of the method include an images collection, a gray processing, a binary processing, an inclination correction of the vehicle license (comprising that a matrix of an image datum collection is founded, the image matrix is centralized, the matrix is calculated, the inclination vector is calculated and an image is obtained after the inclination correction via transforming the coordinate), an expanding correction of the image and an erosion correction of the image. The correcting method for the inclination of a vehicle license of the present invention supports that a new machine learning tool (the vector machine) is applied. The traditional optimal-requesting problem of a Hough space of a vehicle license image is converted to a solution-requesting problem for a linear matrix. The calculation is simplified and the arithmetic efficiency is improved. The randomicity and instability existing in the searching process of the optimal points of parameters such as the obliquity are avoided. For the images with indistinct frame or noise, a better effect can still be obtained.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention belongs to the technical field of intelligent recognition, and in particular relates to a license plate tilt correction method based on a support vector machine. Background technique

[0002] The automatic license plate recognition technology is one of the key technologies of the intelligent transportation system. Its task is to process and analyze the image of the license plate and automatically recognize the license plate. The license plate recognition system can be divided into four parts: license plate location, image preprocessing, character segmentation and character recognition. License plate tilt correction is an important process between license plate location and character segmentation. The license plate image obtained after the license plate location inevitably has a certain degree of inclination. This inclination will not only bring difficulties to the next step of character segmentation, but will also have a direct impact on...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More