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A color scanning document image preprocessing method

A document image, color scanning technology, applied in the direction of image communication, electrical components, etc., can solve problems that do not involve the binarization and denoising process of color or gray images

Inactive Publication Date: 2018-05-01
TIANJIN UNIV
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  • Summary
  • Abstract
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  • Application Information

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Problems solved by technology

This patent is mainly aimed at the post-processing of binary scanned document images, and does not involve the process of binarization and denoising of color or grayscale images

Method used

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  • A color scanning document image preprocessing method
  • A color scanning document image preprocessing method
  • A color scanning document image preprocessing method

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Experimental program
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Embodiment Construction

[0038] The proposed method mainly includes: grayscale, contrast stretching, smoothing filter, binarization and noise removal. figure 1 A block diagram of the proposed method is given. include:

[0039] 1. Grayscale

[0040] The method proposed in this patent first converts an input color scanned document image into a grayscale image. Firstly, the image type of the input scanned document is judged. If it is a grayscale image, go directly to the next step; if it is a color image, use the following process to convert to a grayscale image.

[0041] Use C to represent the input color scanned document image, and its red, green, and blue three-channel images are respectively represented by C R 、C G and C B express. Use formula (1) to get the grayscale image, and express it with L, that is:

[0042]

[0043] 2. Gray scale stretching

[0044] Due to reasons such as scanning equipment, the background of the scanned document image may be dark, and the contrast between the tex...

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Abstract

The invention relates to a color scanned document image preprocessing method. The method comprises: converting an input color scanned document image to a gray-scale image L; carrying out contrast stretch enhancement treatment of L, with the enhancement result expressed by I; smoothing I via a median filter, with the treatment result expressed by F; carrying out moving average binaryzation treatment; and removing noise points. The color scanned document image preprocessing method of the invention achieves excellent anti-noise interference capability, and meanwhile is irrelevant to image content and is suitable for various complex circumstances such as Chinese-English documents, text and graph mix, various writing directions, etc.

Description

technical field [0001] The invention relates to the preprocessing technology for color images, especially the gray scale, binarization and denoising technology for color scanned document images. Background technique [0002] With the rapid development of information technology and the increasing demand for office digitization, digital scanned document images are gradually replacing original paper documents. Scanned document images have the characteristics of small storage space, convenient management, and fast processing. Therefore, the research on document image processing has important practical value. During the scanning process of the document, due to equipment or human factors, the scanned document image may have noise, uneven illumination, and geometric deformation, which will seriously affect the visual quality of the document image. Therefore, it is necessary to enhance the original scanned document image, improve the visual quality of the scanned image, and prepar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N1/405H04N1/409
CPCH04N1/405H04N1/409
Inventor 王建庞彦伟曲畅
Owner TIANJIN UNIV