Document image distortion rectifying method based on structured laser beams

A document image, distortion correction technology, used in image enhancement, image data processing, instruments, etc.

Active Publication Date: 2015-12-02
INST OF AUTOMATION CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] The main purpose of the embodiments of the present invention is to provide a document image distortion correction method based on structured laser lines, which at least partly solves the technical problem of how to correct the geometric distortion of non-planar document images

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  • Document image distortion rectifying method based on structured laser beams
  • Document image distortion rectifying method based on structured laser beams
  • Document image distortion rectifying method based on structured laser beams

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Embodiment Construction

[0092] The technical problems solved by the embodiments of the present invention, the technical solutions adopted and the technical effects achieved are clearly and completely described below in conjunction with the accompanying drawings and specific embodiments. Apparently, the described embodiments are only some of the embodiments of the present application, not all of them. Based on the embodiments in the present application, all other equivalent or obviously modified embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention. Embodiments of the invention can be embodied in many different ways as defined and covered by the claims.

[0093] It should be noted that, in the following description, many specific details are given for the convenience of understanding. It may be evident, however, that the present invention may be practiced without these specific details.

[0094] It should be no...

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Abstract

The invention discloses a document image distortion rectifying method based on structured laser beams. The method at least comprises the following steps: calibrating the intrinsic and extrinsic parameters of a camera and calculating a plane equation of structured laser beams; obtaining a document image; extracting laser beams; estimating a 3D page neatline of the document image according to the calibrated intrinsic and extrinsic parameters of the camera, the plane equation of structured laser beams and the extracted laser beams; performing interpolation on the developable surface according to the 3D page neatline; developing the developable surface with interpolation; and rectifying the image distortion according to the developed developable surface. According to the invention, technical problems of rectification of geometrical distortion of a non-planar document image can be resolved.

Description

technical field [0001] Embodiments of the present invention relate to the technical fields of digital image processing and computer vision, and in particular, to a document image distortion correction method based on structured laser lines. Background technique [0002] When traditional flatbed scanners scan thick documents (such as books and periodicals), because the spine area of ​​the document cannot be completely flat and close to the glass flat surface of the scanner, the resulting text image will eventually have significant image distortion in the spine area. Scan defects such as uniform shading. These scanning defects will seriously affect subsequent document image analysis work (such as layout segmentation of document images, character recognition, etc.). Therefore, as a commonly used document scanning tool, traditional flatbed scanners are usually not suitable for high-quality scanning of non-flat documents. [0003] In order to achieve high-quality scanning of do...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00
Inventor 孟高峰潘春洪向世明王颖汪凌峰
Owner INST OF AUTOMATION CHINESE ACAD OF SCI
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