License plate color judging method based on Bayes classifier

A license plate and color technology, applied in the field of license plate color judgment based on Bayes

Active Publication Date: 2015-08-12
ANHUI TSINGLINK INFORMATION TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The advantage of this type of method is that it has a wide range of applications. For license plates with uniform gray scale, the judgment effect is ver

Method used

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  • License plate color judging method based on Bayes classifier
  • License plate color judging method based on Bayes classifier
  • License plate color judging method based on Bayes classifier

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Embodiment Construction

[0049] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0050] like figure 1 As shown, a Bayes-based license plate color judgment method includes the following steps:

[0051] S1. Normalize the size of the license plate image to be tested to eliminate the influence caused by different sizes. The effect is as follows figure 2 shown.

[0052] S2. Select the effective character area of ​​the license plate image to be tested. The specific method is to select the 0.8Image_width*0.6Image_height area in the center of the license plate image to be tested after normalization to eliminate the interference of the license plate frame and other areas. The effect is as follows image 3 shown.

[0053]S3, using the formula (1), the effective character area of ​​the license plate image to be tested is contrast-enhanced, and the effect is as follows Figure 4 Shown:

[0054] g (

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Abstract

The invention provides a license plate color judging method based on a Bayes classifier. The method comprises the steps of: carrying out size normalization on license plates to be measured; selecting effective character regions of images of the normalized license plates to be measured; carrying out contrast enhancement on the effective character regions of the images of the license plates to be measured; obtaining global statistics characteristics of the images of the license plates to be measured; obtaining local distribution characteristics of the images of the license plates to be measured; obtaining integrated characteristic vectors of images of the license plates to be measured; judging the color types of the license plates based on the Bayes classifier. According to the invention, the global statistics characteristics and the local distribution characteristics of the license plates are integrally adopted, the characteristics are stronger, higher robustness is realized for interference such as color cast and stains of the license plates; in addition, the license plate color is judged based on the Bayes classifier, so that the judging result is more accurate.

Description

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Claims

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Application Information

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Owner ANHUI TSINGLINK INFORMATION TECH
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