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A method for judging the color of license plate based on bayes

A license plate and color technology, applied in the field of license plate color judgment based on Bayes, to achieve strong features, strong robustness, and accurate judgment results

Active Publication Date: 2018-07-17
ANHUI TSINGLINK INFORMATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 very good, but for license plates that contain stains and fading, due to the impact of binarized image quality, this type of method will cause misjudgment.

Method used

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  • A method for judging the color of license plate based on bayes
  • A method for judging the color of license plate based on bayes
  • A method for judging the color of license plate based on bayes

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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] Such as 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]

[0055] Among them, g(x, y) ...

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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

technical field [0001] The invention relates to the technical field of license plate recognition, in particular to a Bayes-based license plate color judgment method. Background technique [0002] The color of the license plate is an important feature of the license plate. In our country, the color type of the license plate is not unique. It mainly includes four types: white characters on a blue background, black characters on a yellow background, white characters on a black background, black characters on a white background, or red characters. If the license plate color is judged incorrectly, it will directly affect the accuracy of the subsequent character segmentation, and then affect the final license plate recognition rate. Therefore, the license plate color type judgment is an essential part of license plate character segmentation, which has an important impact on the accuracy of the entire recognition result. [0003] At present, the commonly used license plate color j...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K9/62
Inventor 张卡尼秀明何佳聂勇
Owner ANHUI TSINGLINK INFORMATION TECH