Automatic license plate recognition method based on image processing

A technology for automatic license plate recognition and image processing, applied in the field of image processing, can solve the problems of high device price, cheating, and high hardware requirements

Inactive Publication Date: 2012-01-25
YUNFENG PIPE IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The IC card identification method has a high recognition rate, fast speed, and is stable and reliable, but it needs a large-scale modification of the vehicle system, high hardware requirements, high price of the whole device, and there is a potential cheating, that is, different vehicles can be exchanged by replacing the radio frequency device. evade inspection
The barcode recognition method has fast recognition speed, high accuracy, strong reliability, and low cost, but it has high requirements for barcode scanners, and it is necessary to formulate a unified national standard, and different vehicles can avoid inspection by changing barcodes. Cheating hidden danger

Method used

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  • Automatic license plate recognition method based on image processing
  • Automatic license plate recognition method based on image processing
  • Automatic license plate recognition method based on image processing

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Experimental program
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Embodiment Construction

[0043] The method of the invention firstly locates the license plate, then performs inclination correction, and finally performs character segmentation and character recognition.

[0044](1) The license plate location method adopts a fast license plate location algorithm that comprehensively uses a variety of license plate features, and uses the license plate texture features, color features and geometric features to locate the license plate. Specific steps are as follows:

[0045] First, set the variable H as the height of the license plate photo in pixels, and the variable W as the width of the license plate photo. Take the variable N of the number of recorded intersection points as 0, and initialize the upper pixel height START and the lower pixel height END of the license plate as 0.

[0046] Set the variable K=H in the first scan, that is, scan from the bottom of the vehicle photo, and then do the following:

[0047] (a) If K>0, scan the Kth row, and the scanning direct...

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Abstract

The invention relates to an automatic license plate recognition method based on image processing. The license plate recognition method in prior art has certain defects. The automatic license plate recognition method adopts the SVM-based method to recognize the license plate characters, includes the sequential steps of license plate positioning, tilt correction, character segmentation and character recognition. The character recognition step adopts the SVM method to recognize the characters on the license plate, firstly performs character characteristic extraction, calculates the parameters for the character recognition through SVM training and utilizes the parameters obtained through training to recognize the characters. The automatic license plate recognition method processes the shot digital images technically to recognize the license plate, has low cost and convenient operation; meanwhile, the method adopts the unique sign of the vehicle as the vehicle recognition basis and avoids the cheating situation.

Description

technical field [0001] The invention belongs to the technical field of image processing, and relates to an improved automatic license plate recognition method based on image processing, which adopts a method based on a support vector machine to recognize license plate characters. Background technique [0002] With the rapid development of our country's economy, the scale of cities and the number of vehicles have expanded rapidly, and the existing traffic capacity can no longer meet the requirements. Problems such as traffic jams, traffic accidents, and environmental pollution have become increasingly prominent. A new subject area: Intelligent Transportation System (Intelligent Transportation System, ITS) came into being. License Plate Recognition (LPR) is an important topic in the field of intelligent transportation. Its task is to analyze and process vehicle images and automatically recognize vehicle license plates. License plate recognition technology mainly involves com...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K9/00G08G1/017
Inventor 孔亚广李功卿沈国江侯平智
Owner YUNFENG PIPE IND
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