Method and device for binarizing document images and document image processor

A document image, binarization technology, used in instruments, character and pattern recognition, computer parts and other directions, can solve the problems of exaggerating the change of the neighborhood grayscale, ignoring the edge features of the image, prone to artifacts, etc., to achieve stable Improve the performance and optimize the effect of the binarization effect

CN101727582BInactive Publication Date: 2014-02-19FUJITSU LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2014-02-19
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a method for binarizing document images, comprising the following steps of: learning: selecting a predetermined number of document images from at least one document image to be binarized in same types through a predetermined first binaryzation algorithm as training samples for learning so as to obtain the attribute of the binary images which correspond to the training samples, wherein the obtained attribute istaken as the public reference attribute of binary images which correspond to the at least one document image to be binarized; and optimal binaryzation processing: carrying out the optimal binaryzation processing on each of the at least one document image to be binarized according to the public reference attribute through a predetermined second binaryzation algorithm so that the attribute of an obtained final binary image of each document image to be binarized is consistent with the public reference attribute. The invention also provides a device capable of executing the method and binarizing the document images and a document image processor assembled with the same. The method and the device can obtain more optimal binaryzation effects and enhance the stability of binaryzation quality.
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Description

technical field

[0001] The invention relates to the technical field of image processing and pattern recognition, more specifically, to a method and device for binarizing document images, and an image processor including the device for binarizing images. Background technique

[0002] Binarization of document images refers to converting color or grayscale document images into binary images. During the binarization process, the usual binarization method only uses the information of a single image to achieve optimal binarization, so there is often a defect that the binarization effect is not optimized, especially when the binarization quality is low. Poor performance on stability. Even for different image copies of the same document, there are often obvious differences in binary document images obtained by using common binarization methods.

[0003] In the binarization process of document images, it is especially important to improve the binarization effect and binarization qu...

Examples

Embodiment Construction

[0016] figure 1 A simplified flowchart of an embodiment of the method for binarizing a document image according to the present invention is shown. like figure 1 As shown, at step S100, at least one document image of the same type to be binarized is input. In step S110, through a predetermined first binarization algorithm, select a predetermined number of document images from the input document images as training samples for learning, so as to obtain the attributes of the binary images corresponding to the training samples, as the The public reference attribute of the binary image corresponding to the at least one document image to be binarized. In step S120, each of the input at least one document image to be binarized is subjected to binarization optimization processing according to the obtained common reference attribute through a predetermined second binarization algorithm, so that each The properties of the obtained binary image are consistent with the common reference ...