License plate locating method based on colorful binary image

A technology of binarized image and color image, applied in the direction of instruments, character and pattern recognition, computer parts, etc., can solve the problem of positioning accuracy limitation, improve the positioning accuracy, improve the positioning accuracy, easy to realize Effect

Inactive Publication Date: 2013-11-20
HOHAI UNIV
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  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

The existing positioning methods based on grayscale images limit the accurac

Method used

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  • License plate locating method based on colorful binary image
  • License plate locating method based on colorful binary image
  • License plate locating method based on colorful binary image

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Embodiment Construction

[0016] Below in conjunction with specific embodiment, further illustrate the present invention, should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention, after having read the present invention, those skilled in the art will understand various equivalent forms of the present invention All modifications fall within the scope defined by the appended claims of the present application.

[0017] Such as figure 1 Said, the positioning method includes: conversion from RGB color model to HSI color model, binarization of license plate color and generation of binarization matrix, utilization of color information, mathematical morphology processing and geometric feature processing.

[0018] Specifically, first convert the collected RGB color image into the HSI color model space, and generate a binary state feature matrix with the same size as the color image according to the color Hue, s...

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Abstract

The invention discloses a license plate locating method based on a colorful binary image. The method comprises the following steps: first, converting collected RGB (Red Green Blue) colorful images into an HSI (Hue-Saturation-Intensity) color model space, conducting colorful binary processing, and initializing binary state feature matrixes being 1; then, setting a saturation threshold, a luminance threshold and a hue threshold to process pixels in the colorful image, and therefore changing the values of 0 and 1 in the binary matrixes; finally, utilizing open and closing operation of mathematical morphology, and combining geometric features of license plate regions to remove a false license plate region; making a horizontal vertical projection to obtain horizontal and vertical ordinates to divide, and finally realizing license plate region locating. The method directly processes information such as hue, saturation and luminance in the image, combines the mathematical morphology and the inherent characteristics of license plates, and fully utilizes the color feature, the texture feature and the size feature of the license plate regions, so that the locating accuracy rate is increased. The method can be more easily realized.

Description

technical field [0001] The invention relates to the technical field of digital image processing and pattern recognition, in particular to a license plate location method based on a color binarized image. Background technique [0002] License plate area location is one of the important components in the automatic license plate recognition system, and it plays a key role in the final recognition of license plate characters. Most of the license plate area location methods are based on grayscale image processing. The collected color images are grayed first and then the area location is realized. A small number of location methods are based on color images, and the existing license plate area based on color images The positioning method is realized by using the background color of the license plate and the color of the characters, that is, only the hue information of the color image is used, and other inherent color information is not involved. The amount of color information use...

Claims

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Application Information

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IPC IPC(8): G06K9/00G06K9/54
Inventor 李东新周祥君
Owner HOHAI UNIV
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