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Character recognition method and system

A text recognition and text technology, applied in the field of image processing, can solve the problems of reducing document image quality, unfavorable image document reading effect, unfavorable analysis and text recognition, etc.

Inactive Publication Date: 2011-07-06
北京文通科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The document image obtained directly usually has a certain degree of geometric distortion, which reduces the quality of the document image, which is not conducive to people's reading effect of the image document, and is also not conducive to later analysis and text recognition

Method used

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  • Character recognition method and system

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Embodiment Construction

[0041] Step 204. Use Hoff transformation to obtain the vertical baseline of the deformation image from the left and right endpoints of the text line.It can also be used to obtain vertical baselines similar to obtaining horizontal baselines.

[0042] Step 205. The intersection of all vertical baselines is weighted at the weight of the intersection point to obtain the vertical direction disappearing point of the deformation image.

[0043]Step 206. Different fitting function f (x) is adopted according to the original surface features of the image. The commonly used method is to use the minimum equalization error method to determine the parameters of the polynomial fitting function f (x).According to the curved surface features, the corresponding fitting method can be selected, such as parabolic line fitting, ellipse fitting, two -dimensional third -order fitting (such as two -dimensional Gaussian fitting).For the transformed curved surface of the pillars, three Bezier curves can be ...

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Abstract

The invention discloses a character recognition method and a system thereof. The method comprises: obtaining geometric characteristic parameters required by correcting a distorted image; equidistantly plotting grids on the distorted image, projecting grid points to an imaging plane; processing quadrangle transformation on each grid to obtain the corrected images of the grids, assembling the corrected images of all grids into a final corrected image; determining the regions of an object character field, matching the region to a region on the final corrected image to do pretreatment, dividing to obtain independent characters; using a recognition algorithm based on gray to recognize independent character images. The technical scheme can recover distorted image to initial state, extract imagecharacters and recognize distorted image.

Description

Technical field [0001] The invention involves the field of image processing technology, especially a method and system for text recognition. Background technique [0002] At present, optical character recognition (OCR) technology has been very mature and formed a series of products. Among them, Chinese OCR recognition technology has been widely used in production and life, and the recognition rate of Chinese printing can reach more than 98 %.However, the current OCR technology can only process the high -definition image obtained from the scanner. The image obtained from the scanner is obtained under the condition of the source document. ThereforeThere is a certain tilt in the angle. For this tilted correction processing, it is actually quite mature. Almost all the commercial OCR software or documentation software for the scanner has corresponding functions. [0003] A Chinese character recognition system can be roughly divided into five parts: input, pre -processing, recognition,...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K9/32G06K9/20
Inventor 张岩于啸
Owner 北京文通科技有限公司