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Fourier transform-based text image deflection correction method

A Fourier transform and text image technology, applied in the field of electronic information, can solve problems such as text image tilt, reduce OCR recognition rate and accuracy, and achieve the effect of improving recognition rate and accuracy

Pending Publication Date: 2018-06-05
蓝盾信息安全技术有限公司
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Problems solved by technology

However, the OCR technology itself is not perfect. When we scan or take pictures of paper documents, it is inevitable that the text image will be tilted. This phenomenon will directly reduce the recognition rate and accuracy of OCR. Therefore, we need a The recognition rate can be effectively improved only by the assistance of other technologies, and the image correction technology that will be mentioned in this article is derived from it.

Method used

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  • Fourier transform-based text image deflection correction method
  • Fourier transform-based text image deflection correction method
  • Fourier transform-based text image deflection correction method

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Embodiment Construction

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0024] (1) Median filtering method for image preprocessing

[0025] In engineering applications, for plain text line images, the size and spacing of each line of text are determined, so along the direction perpendicular to the text line, the text image presents periodic characteristics; for noise, Because of its randomness, it can be filtered out by digital signal processing technology, and then the document image with noise interference can be eliminated for subse...

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Abstract

The invention discloses a Fourier transform-based text image deflection correction method. Mainly, an angular deflection value is analyzed from a frequency domain of a text image through discrete Fourier transform, thereby realizing deflection correction of the text image.

Description

technical field [0001] The invention relates to the field of electronic information, in particular to a text image deviation correction method based on Fourier transform. Background technique [0002] With the advancement of the digital age, many traditional paper books are gradually being digitized, and an important technology for information digitization is OCR technology. However, the OCR technology itself is not perfect. When we scan or take pictures of paper documents, it is inevitable that the text image will be tilted. This phenomenon will directly reduce the recognition rate and accuracy of OCR. Therefore, we need a The recognition rate can be effectively improved only by the assistance of other technologies, and the image correction technology that will be mentioned in this article is derived from it. At present, the document deviation correction technology based on the minimum moment distance fitting of feature points, the deviation correction technology based on ...

Claims

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Application Information

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IPC IPC(8): G06K9/32
CPCG06V10/242
Inventor 杨育斌张彦峰柯宗贵
Owner 蓝盾信息安全技术有限公司
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