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Character recognition method and device

A character recognition and character classification technology, applied in the field of pattern recognition, can solve problems such as use restrictions, and achieve the effect of high recognition rate

Active Publication Date: 2013-01-02
FUJITSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the use of this method in applications with many categories of characters to be recognized is limited.

Method used

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  • Character recognition method and device
  • Character recognition method and device
  • Character recognition method and device

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Embodiment Construction

[0030] Embodiments of the present invention will be described below with reference to the drawings. Elements and features described in one drawing or one embodiment of the present invention may be combined with elements and features shown in one or more other drawings or embodiments. It should be noted that representation and description of components and processes that are not related to the present invention and known to those of ordinary skill in the art are omitted from the drawings and descriptions for the purpose of clarity.

[0031] figure 1 A flowchart of a method for recognizing characters according to an embodiment of the present invention is shown.

[0032] First, in step S102, an orderly four-tuple group composed of four points is selected from the convex hull polygon of the character to be recognized by using the intersection ratio.

[0033] The basic concept of Cross Radio is as follows: If P 0 ,A,B,P 2 The four points are collinear, then the cross ratio Cr i...

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Abstract

The invention relates to a character recognition method and device. The character recognition method comprises the following steps of: selecting a tetrad formed by four points in sequence from a convex hull polygon of a character to be recognized by a cross-ratio; converting the character to be recognized into a perspective invariant coordinate system which is defined by the tetrad; extracting features from the converted character to be recognized so as to obtain feature vectors of the character to be recognized; checking records which are matched with the obtained feature vectors of the character to be recognized in a character class table which is stored in advance, and voting character classes corresponding to the checked records; and repeating the steps on different tetrads on the convex hull polygon of the character to be recognized for preset times, thereby determining the character class having the most votes as a character recognition result.

Description

technical field [0001] The present invention relates to the field of pattern recognition, more particularly to a character recognition method and device. Background technique [0002] Recognition of characters under large perspective deformation is a very important topic, because recognizing characters with perspective deformation is the basis of many practical applications, and characters with perspective deformation widely exist in our daily life, for example, characters in real scenes Character recognition. [0003] To solve this problem, a basic approach is to first rectify the perspective-distorted image to an orthographic image, and then perform traditional OCR (Optical Character Recognition) recognition on the rectified image. But this method is limited by specific applications, such as requiring the existence of outlines and character lines, as well as some structures. So technicians start to focus on recognizing each single character. [0004] Geometric Hashing (...

Claims

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Application Information

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IPC IPC(8): G06K9/64
Inventor 潘攀朱远平孙俊直井聪
Owner FUJITSU LTD
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