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Method for eliminating word seen-through effect of image during document scanning

A document scanning and document image technology, applied in image enhancement, image data processing, instruments, etc., can solve problems such as complex processing methods

Active Publication Date: 2014-09-10
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of method is suitable for the removal of the see-through effect of scanned images, but not for the removal of the see-through effect of scanned documents, and has the disadvantage of relatively complicated processing methods

Method used

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  • Method for eliminating word seen-through effect of image during document scanning
  • Method for eliminating word seen-through effect of image during document scanning
  • Method for eliminating word seen-through effect of image during document scanning

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Embodiment Construction

[0024] figure 1 Shown is a block diagram of the proposed method of the present invention. The method proposed by the present invention is applicable to the following situation: the gray value of the front text in the scanned document image to be processed is basically the same, and the gray value of the back text is also basically the same, and in addition, the gray value of the back text should be higher than that of the front text gray value of .

[0025] Step 1: Grayscale

[0026] Use F to represent the color scanned document image to be processed, use formula (1) for grayscale processing, and use I to represent the grayscale image, that is:

[0027] I ( x , y ) = max c ∈ { r , g , b } F ...

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Abstract

The invention relates to a method for eliminating the word seen-through effect of an image during document scanning. The method for eliminating the word seen-through effect of the image during document scanning comprises the steps that graying is conducted; filtration is conducted according to a mid-value; the mid-value of the gray value of the image is calculated; a text region is separated from a background region; front-side text and back-side text separation is conducted according to the K mean value method, wherein a front-side text subset which corresponds to a subset with the minimum quasi-center gray value, a back-side text subset which corresponds to a subset with the maximum quasi-center gray value and a text subset, to be determined, which corresponds to a subset with a gray value between the minimum quasi-center gray value and the maximum quasi-center gray value are obtained through separation; a new value is assigned to the back-side text region. According to the method for eliminating the word seen-through effect of the image during document scanning, the word seen-through effect of the scanned image in a double-faced document can be effectively eliminated, and the visualization quality of the scanned image is improved.

Description

Technical field [0001] The invention relates to a scanning document image restoration technology, in particular to a method for eliminating the see-through effect of a double-sided document scanning image. Background technique [0002] A common problem when scanning double-sided or handwritten documents is that the text on the back side is visible from the front side. This phenomenon is called the "transparent effect". The reason for the see-through effect is that the text on the back absorbs part of the reflected light. The thinner the scanned paper, or the more severe the ink penetration of the text on the reverse side, the more obvious the see-through effect. When building a digital library, people often need to scan long-standing documents or manuscripts into digital images. Due to the penetration of the paper and the ink, the image of the scanned document has an obvious see-through effect, which will seriously affect the visual quality of the scanned document image. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00
Inventor 王建刘长波
Owner TIANJIN UNIV