License plate location method based on color change points and color density

Abstract

The invention discloses a license plate location method based on color change points and color density. The method mainly aims at reducing influence on locating a license plate caused by inconsonant background and size of the license plate and tilting of the license plate, thereby quickly and accurately capturing an image of a license plate region from a license plate image. The method comprises the following implementation steps of: firstly, classifying image colors in an HSV (hue saturation value) space according to the distance between the colors, and converting the image to only contain eight base colors; then, performing color binaryzation on the license plate image to get four binary images, and judging whether the image contains the license plate according to the number of white pixels; later, initially locating the position of the license plate according to the color change points and bottom color information of the license plate; removing small connected regions in the binaryimages; and finally, continuously shrinking the license plate region according to the color density and the connected region information, until the position of the license plate is accurately positioned. The whole location process has no operations with higher computational complexity, and is excellent in real time property.

Description

Technical field [0001] The invention belongs to the field of intelligent transportation. Based on the color transition point and color density information, the color of the image is classified according to the color distance in the HSV space, the background color and color transition point of each license plate are used to determine the approximate range of the license plate, and the license plate is continuously reduced through the color density and connected domain information Area until the precise location of the license plate. Background technique [0002] With the development of society, people have higher and higher requirements for the transportation system, and vigorously developing Intelligent Transportation System (ITS) has become an urgent problem to be solved. ITS is a comprehensive system that integrates multiple sciences and technologies such as electronics, communications, computers, artificial intelligence, machine vision, and digital image processing. The deve...

AI Technical Summary

Problems solved by technology

[0005] Technical problem: Aiming at the problem that license plate positioning is susceptible to background interference and inconsistencies in license plate size and license plate tilt in natural environments, resulting in incorrect or inaccurate positioning of license plates, the purpose of this invention is to provide a license plate image that has background interference and tilt. The method of locating the license plate based on color jump point and color density can still accurately locate the position of the license plate

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