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Character and background adhesion noise elimination method for image OCR system

A recognition system and noise elimination technology, applied in character and pattern recognition, instruments, computer components, etc., can solve problems such as difficult positioning of sticky noise characters, and achieve the effect of meeting real-time requirements and accurate extraction

Active Publication Date: 2016-03-30
ZHEJIANG UNIVERSITY OF MEDIA AND COMMUNICATIONS
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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for eliminating the cohesive noise between characters and the background of a picture OCR recognition system. Aiming at the OCR technology of existing natural scene pictures, there are deficiencies in noise processing, and a new method for eliminating cohesive noise is proposed. In the complex and changeable natural environment, this method solves the problem that the existing OCR application system has difficulty in locating characters with cohesive noise, realizes accurate extraction of character positions, and can meet the real-time requirements of engineering applications

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  • Character and background adhesion noise elimination method for image OCR system
  • Character and background adhesion noise elimination method for image OCR system
  • Character and background adhesion noise elimination method for image OCR system

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Embodiment Construction

[0048] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0049] Such as figure 1 As shown, it is a flow chart of a method for eliminating the adhesion noise between characters and background of a picture OCR recognition system according to an embodiment of the present invention, and the method includes:

[0050] 1) According to the prior knowledge of the engineering environment applied by the OCR system, the effective range of the stroke length StrokeLen of the character to be recognized is set. This parameter is closely related to the actual project, and should be set as a configurable parameter in the actual application process. When this method is applied to the OCR recognition of bayonet license plate images, this parameter is selected as 35 pixels. In the OCR recognition process of traffic electronic police pictures, this parameter is selected as 30 pixels.

[0051] 2) Select images containing characters to...

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Abstract

The invention discloses a character and background adhesion noise elimination method for an image OCR system, comprising the following steps: (1) setting the effective range of the stroke length of a character to be identified; (2) selecting an image containing the character to be identified in a natural environment, and calculating the difference boundary diagram of the image by means of mean difference template; (3) thresholding the obtained difference boundary diagram of the image to be identified to form a ternary-valued boundary diagram of the image to be identified; and (4) carrying out searching in the ternary-valued boundary diagram according to the angle-of-inclination range and the linear boundary. By using the character and background adhesion noise elimination method for the image OCR system of the invention, the problem that a character with adhesion noise is hard to position for the existing OCR application system is solved in a complex and changeable natural environment, the character position can be extracted accurately, and the real-time requirements of engineering application can be satisfied.

Description

technical field [0001] The invention relates to a natural scene picture OCR recognition system, in particular to a method for eliminating the adhesion noise between characters and background in the picture OCR recognition system. Background technique [0002] In the field of artificial intelligence, optical character recognition (OCR) is a very important technology. Due to the popularity of smart phones and the need for classification and search of massive images in cloud storage, OCR recognition of natural scene images has become a hot research topic in recent years. OCR Technology generally includes several processes such as character positioning, character cutting, and character recognition, among which the speed and accuracy of character positioning directly affect the quality of OCR recognition technology and are the key to the entire OCR system. [0003] OCR character positioning usually uses the structural information of the string to locate the area where the string ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/34
CPCG06V10/273G06V10/267
Inventor 王忠周庆标覃方颖
Owner ZHEJIANG UNIVERSITY OF MEDIA AND COMMUNICATIONS
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