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License plate character segmentation method based on grey level histogram binaryzation

A grayscale histogram and character segmentation technology, which is applied in the field of license plate recognition, can solve problems such as the decrease in accuracy of segmentation, large differences in character segmentation effects, and large dependence on binary images, so as to achieve the effect of easy area segmentation

Active Publication Date: 2013-09-25
SUZHOU INDAL TECH RES INST OF ZHEJIANG UNIV
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Problems solved by technology

[0008] Character segmentation using the projection method is relatively dependent on the binary image, and the character segmentation effect of the license plate image taken under different lighting conditions is quite different. When the quality of the binary image is not high, the accuracy of the segmentation will drop a lot.

Method used

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  • License plate character segmentation method based on grey level histogram binaryzation
  • License plate character segmentation method based on grey level histogram binaryzation
  • License plate character segmentation method based on grey level histogram binaryzation

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Embodiment Construction

[0033] The license plate character segmentation method based on grayscale image binarization of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0034] Such as figure 1 As shown, a license plate character segmentation method based on grayscale image binarization, including the following steps:

[0035] (1) Convert the original color license plate image into a grayscale image (such as figure 2 shown), calculate the gray mean r of the region of interest in the gray image avg , and the number of pixels corresponding to each gray value.

[0036] The original color license plate image is converted into a grayscale image, according to the following formula:

[0037] Y=0.110B+0.588G+0.302R

[0038] Among them, Y is the gray value, and B, G, R are the values ​​of the primary color spectral components in the BRG color model.

[0039] The grayscale image of the license plate is a rectangle, cut off 1 / 5 of the upper and lower...

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Abstract

The invention discloses a license plate character segmentation method based on grey level histogram binaryzation. The plate character segmentation method comprises the following steps of converting an original color license plate image into a gray level image, calculating the gray average of the interest region in the gray level image and a gray level histogram, namely, the number of the pixel points corresponding to all gray values, sequentially verifying whether the gray values can meet set binaryzation threshold conditions, using the corresponding gray values as the binaryzation thresholds to carry out binaryzation treatment on the license plate image if the binaryzation threshold conditions are met, and utilizing a projection method to segment a binaryzation image to obtain license plate characters. The license plate character segmentation method based on the grey level histogram binaryzation can little affected by factors of uneven illumination, license plate contamination and the like, can set the binaryzation threshold of the license plate gray level image in a self-adaption mode, separates the license plate characters from a background area, obtains a clear binary image and can conveniently utilize the projection method to regionally segment the binaryzation image.

Description

technical field [0001] The invention relates to the field of license plate recognition, in particular to a grayscale histogram-based Figure II Value-based license plate character segmentation method. Background technique [0002] In the field of traffic supervision, the application of intelligent identification is becoming more and more extensive. License plate recognition technology refers to the technology that can detect vehicles on the monitored road and automatically extract vehicle license plate information (including Chinese characters, English letters, Arabic numerals and license plate colors) for processing. [0003] License plate recognition is one of the important components of modern intelligent transportation systems. The unique license plate number of a car to complete the identification process. [0004] The combination of license plate recognition technology and some follow-up processing methods can realize parking lot fee management, traffic flow control ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/34G06K9/32
Inventor 许毅杰
Owner SUZHOU INDAL TECH RES INST OF ZHEJIANG UNIV
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