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Image enhancement and binaryzation method for photoprint file

A document image, binarization technology, applied in the field of image processing, can solve problems such as signal-to-noise ratio image enhancement

Active Publication Date: 2015-07-01
CENT SOUTH UNIV
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Problems solved by technology

[0004] In order to solve the above technical problems, the present invention provides a photocopy document image enhancement and binarization method, using the LC method of fusion image gradient information to realize local enhancement processing of the image, and then using the global self-adaptive Otsu method to realize image binarization Value-based, simple and effective solution to low signal-to-noise ratio image enhancement and binarization problems

Method used

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  • Image enhancement and binaryzation method for photoprint file
  • Image enhancement and binaryzation method for photoprint file
  • Image enhancement and binaryzation method for photoprint file

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Embodiment Construction

[0027] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0028] Such as figure 1 As shown, a photocopy document image enhancement and binarization method includes the following steps:

[0029] Step 1: Perform grayscale processing on the input color image to obtain a grayscale image;

[0030] [Convert the color image to a grayscale image to reduce the amount of calculation;]

[0031] Step 2: Use Sobel horizontal and vertical operators to obtain the edge gradient of the local image block corresponding to each pixel, and the edge gradient vector The expression is as follows:

[0032] ▿ I ( x , y ) = G x G y ...

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Abstract

The invention discloses an image enhancement and binaryzation method for a photoprint file. The image enhancement and binaryzation method for the photoprint file comprises the following steps of step one, graying input color images and obtaining graying images; step two, obtaining edge gradient of a regional image block which is corresponding to every pixel point through Sobel horizontal and vertical operator; step three, performing weight fusion improvement and LC regional enhancement and obtaining a weight fusion regional contrast value for every pixel point; step four, enabling the weight fusion regional contrast value for every pixel point to serve as a pixel value of the corresponding pixel point to obtain enhancement images of the input images. According to the image enhancement and binaryzation method for the photoprint file, the existing LC algorithm is performed on weight fusion improvement by improving the existing regional enhancement algorithm, the provided image enhancement algorithm is prior in effect compared with the existing file image enhancement and binaryzation method, has a good time performance and further improves the image preprocessing speed, and compared with the prior art, the image enhancement and binaryzation method is simple in parameter adjustment and the achievement process is simple and easy to operate.

Description

technical field [0001] The invention belongs to the field of image processing, in particular to a photocopying document image enhancement and binarization method. Background technique [0002] In the field of computer vision and image processing, image enhancement and binarization processing methods are one of the most basic and important research contents of image analysis and recognition. At present, there are many image enhancement and binarization methods, but most of the researches are aimed at The image captured by a video camera or camera, while the photocopy document image obtained by a copier or scanner is different from the scanning equipment and the subjectivity of the operator, so the commonly used image enhancement and binarization methods fail or have unsatisfactory results. In recent years, with the development of computer technology and network technology, more and more photocopied documents are uploaded to the network through copying or scanning, as importan...

Claims

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Application Information

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IPC IPC(8): G06T5/00
Inventor 龙军刘献如刘倩张昊
Owner CENT SOUTH UNIV
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