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License plate identification method and device

A license plate recognition and license plate image technology, applied in the field of intelligent transportation, can solve the problems of license plate recognition, low compatibility of license plate recognition methods, license plate area segmentation, etc.

Active Publication Date: 2018-06-01
HANGZHOU HIKVISION DIGITAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the type of the license plate in the license plate image to be recognized is not within the range of the above types, the license plate area cannot be correctly segmented according to the above license plate template, and the above method cannot be used for license plate recognition. Therefore, the license plate recognition in the prior art The compatibility of the method is not high

Method used

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  • License plate identification method and device
  • License plate identification method and device

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specific Embodiment approach

[0188] The above description is a specific implementation method included in step S102B3 when the vertical projection value is obtained from the binarized license plate image area with white characters and black background. Based on the same thinking, when the vertical projection value is obtained according to the binarized license plate image area with black characters and white background, the following specific implementation methods included in step S102B3 can be obtained, specifically including the following steps 1 and 2:

[0189] Step 1: Determine the pixel point in the license plate image area corresponding to the vertical projection value that meets the following conditions as the character segmentation point of the left segmentation point type:

[0190] proj(i)≥proj_th(i) and proj(i+1)

[0191] Step 2: Determine the pixel point in the license plate image area corresponding to the vertical projection value that meets the following conditions as the charac...

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Abstract

The embodiments of the application provide a license plate identification method and device, which relate to the technical field of intelligent transportation. The method comprises the following steps: obtaining a license plate image area of a license plate number to be identified; determining character segmentation points in the license plate image area; obtaining alternative character area segmentation modes corresponding to the license plate image area according to the determined character segmentation points; for each of the alternative character area segmentation modes, carrying out character identification on the license plate image area to obtain a character identification result; and obtaining a license plate number corresponding to the license plate image area according to the character identification results. By using the technical scheme in the embodiments of the invention, the compatibility of license plate identification can be improved.

Description

technical field [0001] The present application relates to the technical field of intelligent transportation, in particular to a license plate recognition method and device. Background technique [0002] The license plate is the "identity card" of the vehicle, which is an important information that distinguishes it from other motor vehicles. License plate recognition technology has been widely used in checkpoints, parking lots, and electronic police to obtain the license plate information of vehicles in the scene, and exert the power of "intelligent traffic algorithm" in many aspects such as public security management. [0003] In the prior art, when the license plate number in the license plate image to be recognized is recognized, the license plate image to be recognized is usually matched with a plurality of pre-saved license plate templates one by one, and then the license plate number is recognized. The specific process is: locate the license plate area in the license p...

Claims

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Application Information

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IPC IPC(8): G06K9/34G06K9/46G06K9/62G06K9/32
CPCG06V20/63G06V10/267G06V10/50G06V20/625G06F18/2411
Inventor 韦立庆何海峰钮毅罗兵华朱江
Owner HANGZHOU HIKVISION DIGITAL TECH
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