License plate data index structure building method, retrieval method and device

A technology of index structure and establishment method, applied in the field of retrieval, can solve the problems of complexity, low execution efficiency, complex index structure, etc.

Inactive Publication Date: 2016-05-18
HANGZHOU HUAWEI ENTERPRISE COMM TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

The index structure used in the current license plate retrieval method is complex, which makes the license plate retrieval process more complicated and the execution efficiency lower

Method used

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  • License plate data index structure building method, retrieval method and device
  • License plate data index structure building method, retrieval method and device
  • License plate data index structure building method, retrieval method and device

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Embodiment Construction

[0082] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0083] The index structure establishment method, retrieval method and device of the license plate data provided by the embodiment of the present invention can be used for storage and retrieval of 4-8 digit license plate data. The license plate data involved in the embodiment of the present invention includes English characters, Arabic numerals and Chinese characters.

[0084] In order to improve the execution efficiency of license plate retrieva...

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Abstract

The invention discloses a license plate data index structure building method, retrieval method and device. The method of the invention comprises following steps: extracting every license plate data from a license plate database, aiming at each extracted license plate data, executing following steps: expressing the license plate data by a pre-built license plate model, operating the information in the normal character zone of the license plate model, taking the obtained operation value as the storage address in a preset storage space; and storing the information in an attribute zone in the storage location corresponding to the storage address in a storage space. In the license plate retrieval process, a retrieval condition based on preset license plate model expression is obtained; the information stored in the normal character zone of the retrieval condition is extracted; the extracted information is operated; the obtained operation value is taken as a retrieval address; and the corresponding information is matched out from the information stored at the storage location corresponding to the retrieval address in the preset storage space. According to the methods and the device of the invention, the license plate retrieval execution efficiency can be improved.

Description

technical field [0001] The invention relates to the technical field of retrieval, in particular to a method for establishing an index structure of license plate data, a retrieval method and a device. Background technique [0002] License plate recognition technology is an important part of modern intelligent transportation systems. However, in the case of limited license plate recognition conditions (image quality is not high, license plate is blocked, etc.), the license plate recognition rate in practical applications is not always satisfactory. . Therefore, under the condition of limited license plate recognition conditions, in order to determine the license plate information, it is necessary to recognize a part of the license plate information based on computer vision technology, etc., and then search in the massive license plate database based on the existing data. [0003] Most of the current license plate retrieval methods are based on the index structure established ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/30
Inventor 鞠伟方鑫周剑辉邬征宇梁超
Owner HANGZHOU HUAWEI ENTERPRISE COMM TECH
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