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Image processing method, image processing device and scanner

An image processing and two-dimensional image technology, applied in the field of image processing, can solve problems such as limited range of use and inconvenience

Inactive Publication Date: 2015-03-11
FUJITSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this method is that it is very inconvenient for the user to use a grid paper to calibrate the pages of the book each time
These methods are somewhat limited in scope because they assume that the pages contain very long lines of text

Method used

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  • Image processing method, image processing device and scanner
  • Image processing method, image processing device and scanner
  • Image processing method, image processing device and scanner

Examples

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Embodiment Construction

[0022] Embodiments of the present invention will be described below with reference to the drawings. Elements and features described in one drawing or one embodiment of the present invention may be combined with elements and features shown in one or more other drawings or embodiments. It should be noted that representation and description of components and processes that are not related to the present invention and known to those of ordinary skill in the art are omitted from the drawings and descriptions for the purpose of clarity.

[0023] figure 2 A simplified flowchart of an image processing method according to an embodiment of the present invention is shown. As shown in the figure, the image processing method 200 starts at S210, and then includes: Finding the vanishing point on the curved surface in the two-dimensional image obtained by the shooting device (S220); extracting the vanishing point on the curved surface with a width of a specific unit All straight lines betw...

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Abstract

An image processing method generally includes: obtaining a vanishing point on a curve surface in a two-dimension image; extracting all the straight line segments between a top contour line and a bottom contour line of the curve surface by the vanishing point; removing a perspective distortion to get parallel straight line segments; obtaining the lengths of the straight line segments, obtaining the true width of each of the straight line segments in a three-dimension space and the depth increment of the straight line segments according to the lengths; obtaining the expanded width of each straight line segment according to the true width and the depth increment; obtaining the total expanded width of the curve surface to transform it into a flat surface; transforming image contents on the curve surface onto the flat surface. The method can be applied when scanning an open book.

Description

technical field [0001] The invention relates to the field of image processing, in particular to an image processing method for de-distorting captured images. Background technique [0002] When an image of a book is captured by a non-contact scanner or camera, the book will have a certain curvature due to its thickness. As a result, the image captured by the scanner or camera will have geometric distortions caused by the curvature. Figure 1a An example of an image of a book scanned by a non-contact scanner with distortion caused by bending is shown. It is difficult to read the content in this book, and using such distorted images for subsequent operations, the recognition accuracy is also low. [0003] Various methods have been proposed to correct distortions in distorted book images. Traditional book image correction methods can be divided into two categories: content-independent correction methods and content-based correction methods. [0004] For a content-independent ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N1/387H04N1/00
CPCH04N1/387G06T3/0031G06V10/243G06V10/247G06T3/00
Inventor 郑大念孙俊直井聪
Owner FUJITSU LTD
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