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A Correction Method of Document Image Distortion

A document image, image technology, applied in the field of document image distortion correction

Active Publication Date: 2022-08-05
陈思远
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method allows very precise corrections to the page and is fast and independent of the content of the page, but requires specific equipment to fire the laser beam at the exact location

Method used

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  • A Correction Method of Document Image Distortion
  • A Correction Method of Document Image Distortion
  • A Correction Method of Document Image Distortion

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Embodiment Construction

[0024] A specific embodiment of the present invention will be described below with reference to the accompanying drawings. Obviously, this embodiment is not all embodiments, and the combination of claims under different limited conditions will produce different specific embodiments.

[0025] figure 1 is the overall flow chart of the present invention, such as figure 1 As shown, the invention at least includes the following steps:

[0026] Step S1: down-sampling the image. Generally, in a document image, the edge of the page is a smooth curve, and the area within the outline of the page also occupies a large part of the image area. Since there is inevitably noise in the image captured by the camera, noise reduction is performed first before edge detection. The most convenient way to reduce pixel noise is to use downsampling through averaging filtering to reduce the image resolution. In general, the edge of the page is a smooth curve, and reducing the image resolution will ...

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Abstract

The invention belongs to the field of image processing, in particular to a method for correcting document image distortion in the digital processing of paper documents (books, journals, etc.). The invention provides a paper document image correction method. The method at least includes: down-sampling the image; extracting and filtering the page edge in the down-sampled image; obtaining the page outline based on the page edge fitting and interpolation; and stretching and correcting the original image page based on the outline. The present invention solves the problem of image distortion correction of curved documents based on a single two-dimensional image and does not depend on text lines.

Description

Technical field: [0001] The invention relates to the field of digital image processing, in particular to a method for correcting document image distortion in the process of digital processing of paper documents (books, journals, etc.). Background technique: [0002] As the resolution of cameras continues to increase, we can use these devices to capture pages of books to obtain an image close to the scanning resolution for non-contact scanning. However, the problem of geometric distortion of the document page in the image captured by the camera cannot be eliminated by changing the shooting angle of the camera device. The existence of geometric distortion will seriously affect the results of subsequent information analysis such as Optical Character Recognition (OCR), document page segmentation, and image recognition. [0003] In order to solve the problem of distortion and deformity, people have proposed a variety of solutions. These methods can be divided into correction met...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/00G06T7/13G06V30/16G06V30/18G06V30/41
CPCG06V30/40G06V10/20G06V10/247G06V10/44G06T5/80
Inventor 陈思远
Owner 陈思远
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