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License plate identification system based on integral feature channels and gray projection

A license plate recognition and grayscale projection technology, applied in the field of license plate recognition systems, can solve the problems of old license plates, complex picture backgrounds, and low resolution.

Inactive Publication Date: 2017-03-22
HUNAN VISION SPLEND PHOTOELECTRIC TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The difference is that the pictures collected at intersections have complex backgrounds, uneven lighting, low resolution, old license plates, dirty license plates, etc., all of which have brought great difficulties to license plate recognition. For these specific practical problems, The invention proposes a license plate automatic positioning, segmentation and recognition system

Method used

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  • License plate identification system based on integral feature channels and gray projection
  • License plate identification system based on integral feature channels and gray projection
  • License plate identification system based on integral feature channels and gray projection

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Embodiment Construction

[0101] Taking the license plate recognition system based on integral channel features and grayscale projection as an example, the present invention will be further described in detail in conjunction with the accompanying drawings.

[0102] S1. License plate positioning;

[0103] S1.1 Training license plate sample feature extraction and feature organization;

[0104] S1.1.1 Manually extract any normal national standard license plate;

[0105] S1.1.2 Carry out integral channel feature extraction on the extracted license plate image;

[0106] The integral channel feature was proposed by Dollár P et al. in 2009. It is usually used for pedestrian detection at the earliest, and it is a detection operator with better evaluation effect at present. The basic idea is that by performing various linear and nonlinear transformations on the input graph, many common features of the image, such as local summation, histogram, Haar and their variants, can be calculated quickly and efficiently...

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Abstract

The present invention relates to the computer vision field, in particular to a license plate identification system based on integral channel features and the gray projection. Aiming at the specific problem of the license plate identification, the system comprises three steps of 1 license plate positioning; 2 license plate character segmentation; 3 character identification and output after the license plate character segmentation. The system of the present invention effectively overcomes the difficulties in the image processing that the acquired images are complicated in background, non-uniform in illumination and low in resolution, the license plates are old and dirty, etc., and an identification method provided by the present invention is high in license plate character reading reliability and good in identification degree and robustness, at the same time, is simple in step calculation, can keep a high efficiency, has a real-time performance capable of satisfying the demands, and has the important promotion effect for the road traffic and the parking lot vehicle management.

Description

technical field [0001] The invention relates to the field of computer vision, in particular to a license plate recognition system based on integral feature channels and grayscale projection. Background technique [0002] With the development of modern transportation, automatic vehicle license plate recognition technology has been paid more and more attention, and it is one of the important research topics of computer vision and pattern recognition technology in the field of intelligent transportation in recent years. The automatic vehicle license plate recognition system can be used for vehicle management in highway toll stations, parking lots, intersections and other places, and plays an important role in promoting road traffic and parking lot vehicle management. [0003] License plate recognition technology includes three basic links of license plate location, character segmentation and character recognition, among which license plate location is the premise of character s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/32G06K9/62
CPCG06V20/63G06V20/625G06F18/2148G06F18/24
Inventor 张斯尧姜德财
Owner HUNAN VISION SPLEND PHOTOELECTRIC TECH
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