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

Inactive Publication Date: 2008-02-06
XIAN UNIV OF TECH
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AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a license plate tilt correction method based on a support vector machine, and apply the calculation principle of the support vector machine to the tilt correction of the vehicle license plate to solve the problem that the existing license plate tilt correction method has a large amount of calculation and low accuracy The problem

Method used

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  • License plate sloped correcting method based on supporting vector machines
  • License plate sloped correcting method based on supporting vector machines
  • License plate sloped correcting method based on supporting vector machines

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Experimental program
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Embodiment

[0072] a. Install the camera at a suitable location at a highway intersection, toll booth or parking lot, and collect images after the vehicle enters the camera range to obtain the original image containing the license plate image, as shown in Figure 2.

[0073] b. Carry out grayscale judgment on the original image of the vehicle obtained in step a, if the original image of the vehicle captured is a grayscale image, no processing is performed; if the original image of the vehicle captured is a true color image, then the vehicle is processed The original image is converted to grayscale to obtain a grayscale image containing the license plate;

[0074] c. Perform binarization processing on the grayscale image obtained in step b, and turn it into an image with only "0" and "1" values, which is convenient for subsequent processing, as shown in Figure 3.

[0075] D. The image obtained in step c is processed as follows, and the corrected license plate image is obtained:

[0076] d1...

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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.

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

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/46G06T7/00
Inventor 刘涵
Owner XIAN UNIV OF TECH
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