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Number plate image preprocessing method

A license plate image and preprocessing technology, applied in the fields of instruments, character and pattern recognition, computer parts, etc. Easy to achieve effects

Active Publication Date: 2012-06-20
QINGDAO HISENSE TRANS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention provides a license plate preprocessing method to solve the problem of serious information loss in the "binarized license plate image" caused by the existing yin and yang plate phenomenon, which is simple to implement and effectively improves the license plate recognition rate

Method used

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  • Number plate image preprocessing method

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Embodiment 1

[0035] Embodiment one, see figure 2 As shown, the preprocessing method of the license plate image of the present embodiment comprises the following steps:

[0036] S1. Obtain the upper and lower boundaries of the character area of ​​the license plate.

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Abstract

The invention discloses a number plate image preprocessing method, which comprises the following steps of: (1) obtaining the upper boundary and the lower boundary of a number plate character region; (2) determining a Yin and Yang boundary line of the number plate character region, wherein the Yin and Yang boundary line is a boundary line formed through brightness difference of a number plate; (3)calculating whether the number plate character region requires the brightness compensation or not; and (4) carrying out brightness compensation on the plate number character region. The number plate image preprocessing method has the advantages that the plate number identification rate of the Yin and Yang number plate can be obviously improved, in addition, the realization is easy, the calculation quantity is small, and the real-time processing requirement can be met.

Description

technical field [0001] The invention relates to a preprocessing method of a license plate image and belongs to the technical field of digital image processing. Background technique [0002] In the process of realizing the license plate recognition, both the character segmentation link and the character recognition link must use binary information. For a license plate image, if there is a shadow in a certain local area, causing the brightness of the entire license plate area to be significantly unbalanced, then its binary image will have relatively serious character information defects, which will seriously affect the segmentation and recognition results. see figure 1 As shown, this is a typical case of "Yin-Yang card problem". Among them, picture A is a grayscale image of the license plate, and it can be seen that there is a significant difference in brightness between the upper and lower parts of the license plate. If you do binarization on image A to get image B, you wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/36
Inventor 卜珂陈维强朱中王晓曼魏楠楠刘韶
Owner QINGDAO HISENSE TRANS TECH
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