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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: 2009-06-17
北京文通科技有限公司
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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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Embodiment Construction

[0039] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and through specific implementation methods.

[0040] The main idea of ​​the technical solution of the present invention is to start from the imaging geometric relationship of the lens system, and analyze the causes of the two most frequently encountered document image geometric distortions when shooting with a camera: perspective distortion and binding line bending distortion. The general cylindrical model is abstracted into a Bezier cylindrical model, and the non-parametric model is converted into a parametric model, and a set of parameter estimation and image correction algorithms are given by using the geometric model, which not only solves the correction problem of gutter distortion, Moreover, perspective distortion can be corrected as a special case of the model.

[0041] figure 1 It is a structural schematic diagram of a character recogn...

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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 image characters and recognize distorted image.

Description

technical field [0001] The present invention relates to the technical field of image processing, in particular to a method and system for character recognition. Background technique [0002] At present, optical character recognition (OCR) technology has been very mature and formed a series of products, among which Chinese OCR recognition technology has been widely used in production and life, and the recognition rate of Chinese printed characters can reach more than 98%. However, the current OCR technology can only process high-definition images obtained from scanners. The images obtained from scanners are obtained under the condition that the source documents are completely flat, so there is almost no geometric distortion, and the obtained image values ​​may be in the There is a certain inclination in the angle, and the correction processing for this inclination is actually quite mature, and almost all commercial OCR software or document acquisition software for scanners ha...

Claims

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Application Information

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IPC IPC(8): G06K9/32G06K9/20
Inventor 张岩于啸
Owner 北京文通科技有限公司
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