Document image processing method and device

Abstract

The invention discloses a document image processing method and device, and the method comprises the steps: carrying out the image denoising processing of an RGB document image through a negative noisethree-channel color relation, and obtaining a denoised document image; based on the minimum bounding rectangle of each foreground connected region in the denoised document image, obtaining a target rotation direction and a target rotation angle by using a preset correction rule, and performing image correction on the denoised document image to obtain a corrected document image; and for the correction document image, performing image coloring processing and image trimming processing through background three-channel clustering in combination with the RGB document image to obtain a target document image. Visibly, the image processing effect of the RGB document image is improved from the aspects of image denoising, image correction, image coloring and image trimming, and the image processingrequirement of the RGB document image is met.

Description

technical field [0001] The present application relates to the technical field of image processing, and in particular to a method and device for document image processing. Background technique [0002] With the development of information technology, historical paper documents can be converted into electronic documents with the help of information technology, that is, historical paper documents are processed by cameras, video cameras or scanners to obtain RGB document images. Compared with historical Paper documents have the advantages of convenient delivery, easy extraction, and small footprint. [0003] Because historical paper documents are printed and used, there may be some phenomena such as partial smearing, blurred fonts, and more stains, resulting in some image noise in the processed RGB document images; and the angle of shooting or scanning during processing For other reasons, the RGB document image obtained through processing generally has the problem of image tilt,...

AI Technical Summary

Problems solved by technology

[0004] However, the inventor found through research that currently only one or two image processing methods are used for image processing of RGB document images, and traditional image denoising methods, image correction methods or image coloring methods are only for specific The image processing effect of the image is good, which is not suitable for RGB document images, resulting in poor image processing effects of RGB document images, which cannot meet the image processing requirements of RGB document images

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