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License plate positioning method and apparatus based on multiple characteristics

A license plate positioning and multi-feature technology, applied in the field of license plate recognition, can solve the problem of not meeting the requirements of the license plate recognition system, and achieve the effects of high accuracy, strong robustness and low background dependence.

Inactive Publication Date: 2011-10-26
WUHAN JIAYEHENG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

This method avoids the interference of the complex environment outside the vehicle body by detecting the limited license plate search area of ​​the vehicle body. The premise is that the background of the vehicle body must be static and will not affect the positioning of the vehicle body. Identify system requirements

Method used

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  • License plate positioning method and apparatus based on multiple characteristics
  • License plate positioning method and apparatus based on multiple characteristics
  • License plate positioning method and apparatus based on multiple characteristics

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Embodiment Construction

[0048] The embodiments of the present invention will be described in detail below with reference to the drawings.

[0049] reference figure 1 , This figure is an implementation flow chart of an embodiment of the multi-feature-based license plate location method provided by the present invention, and the specific steps are as follows:

[0050] In the image size adaptation step S1, the width and height of the original RGB color image captured by the camera are respectively compared, if the image width nWidth' is greater than the preset image width threshold nTHresholdWidth or the image height nHeight' is greater than the preset image height threshold nThresholdHeight , The size of the image is reduced to the preset image width threshold nTHresholdWidth and image height threshold nThresholdHeight range.

[0051] In specific implementation, the setting of the thresholds nThresholdWdith and nThresholdHeight is related to the specific application scenarios of this embodiment, such as the i...

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Abstract

The invention discloses a license plate positioning method based on multiple characteristics. The method comprises: the vertical direction edge density characteristic of an RGB colored image is utilized to detect the license plate area in an image and a binary image template in line with the license plate texture density characteristic area is obtained; the R, G and B pigment component value of each pixel of the RGB colored image are compared in an RGB colored space and a plurality of mask layer images of the pixels in line with preset color conditions are obtained; a logical calculation is carried out between each mask layer image and the binary image template, overlap areas are eliminated according to a preset color priority sequence and the mask layer image of each zero lap area is obtained; the abnormal area, the abnormal width high and width high ratio area, the abnormal edge density area and the abnormal color area of each mask layer image are eliminated to obtain a final license plate positioning image. The invention also discloses a corresponding license plate positioning apparatus based on multiple characteristics. The invention can be free from complex background interferences and is characterized by quick positioning speed, high accuracy and strong robustness.

Description

Technical field [0001] The present invention relates to license plate recognition technology, in particular to a method and device for license plate positioning based on multiple features. Background technique [0002] With the development of information technology, the application of intelligent transportation systems in the field of traffic management has become increasingly widespread. The license plate recognition system is an important content in the field of intelligent transportation, and is widely used in various occasions such as highway toll management systems, urban traffic intelligent monitoring, and intelligent parking lot entry and exit registration. The license plate recognition system usually includes three links: license plate location, character segmentation and character recognition. Among them, the license plate location technology is a very critical link. The accuracy of positioning directly affects the recognition accuracy of the entire license plate recogni...

Claims

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Application Information

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IPC IPC(8): G06K9/00G06K9/38G06K9/40
Inventor 肖长诗林道庆
Owner WUHAN JIAYEHENG TECH
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