Multi-view distorted document image geometric correction method based on mobile terminal

A document image and mobile terminal technology, applied in the field of computer vision, can solve the problem of low OCR recognition accuracy, and achieve the effect of improving the accuracy, saving computing resources, and reducing the amount of calculation.

Active Publication Date: 2019-07-26
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0004] However, the current document image geometric correction algorithm has the problem of low OCR recognition accuracy

Method used

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  • Multi-view distorted document image geometric correction method based on mobile terminal
  • Multi-view distorted document image geometric correction method based on mobile terminal
  • Multi-view distorted document image geometric correction method based on mobile terminal

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Embodiment Construction

[0043] The technical solutions in the embodiments of the application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the application. Obviously, the described embodiments are only a part of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative work, all belong to the scope of protection of this application. The relevant directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship between the components in a certain posture (as shown in the drawings). Sports conditions, etc., if the specific posture changes, the directional indication will also change accordingly.

[0044] As described in the background art, document image geometric correction algorithms in the pr...

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Abstract

The invention discloses a multi-view document image geometric correction method based on a mobile terminal. The multi-view document image geometric correction method comprises the following steps: shooting left and right view distorted document images of an unfolded bent document; compressing the shot left and right visual angle distorted document images; performing feature point matching on the compressed left and right visual angle distorted document images to obtain a feature point matching pair set; based on calibration internal parameters of the camera, solving a rotation matrix and a translation vector when left and right visual angle distorted document images are shot; calculating three-dimensional coordinate points of the unfolded and bent document page based on the solved rotationmatrix and translation vector of the camera when the left and right visual angle distorted document images are shot; constructing an expandable curved surface model for the unfolded curved document page by adopting the calculated three-dimensional coordinate points; and correcting the three-dimensional coordinate points to a two-dimensional plane based on the constructed developable curved surface model, and filling a blank area to obtain a final flat plane image. According to the scheme, the OCR recognition accuracy of the distorted document image can be improved.

Description

technical field [0001] The invention belongs to the technical field of computer vision, in particular to a mobile terminal-based geometric correction method for distorted document images from multiple perspectives. Background technique [0002] In order to meet the huge demand for information and reduce the labor load when people collect information, information digitization technology emerges as the times require. Among them, the optical character recognition (Optical Character Recognition, OCR) technology can realize the rapid entry of document content, greatly reduces people's manual labor, and thus is widely used. [0003] For some folded, twisted, thick text documents, it is necessary to carry out geometric correction to the obtained document image after taking the corresponding document image. [0004] However, the current document image geometric correction algorithm has the problem of low OCR recognition accuracy. Contents of the invention [0005] The technical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/34G06K9/32G06K9/36
CPCG06V30/1478G06V10/247G06V10/20G06V30/153
Inventor 肖学中束彩炜韩贝贝
Owner NANJING UNIV OF POSTS & TELECOMM
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