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Documentary archive image compressing method

An image compression and archival technology, applied in image communication, digital video signal modification, electrical components, etc., can solve problems such as large image storage space and image distortion, achieve high compression ratio, reduce storage space, and facilitate preservation. Effect

Inactive Publication Date: 2015-06-24
EAST CHINA NORMAL UNIV
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  • Description
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Problems solved by technology

[0005] The invention overcomes the defects of large image storage space and image distortion caused by lossy compression in the prior art, and proposes a file image compression method

Method used

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Embodiment

[0041] Document files are often disturbed by noise during the scanning process, which affects subsequent processing, so image preprocessing is required. Preferably, the present invention adopts a color image enhancement method to improve the visual effect of the image. To process color images, you first need to choose an appropriate color model. Commonly used color models include RGB, YUV, and HSI. The most commonly used RGB color model is related to the display system, and computer monitors use RGB to display colors. It is a mixed color model, which is obtained by mixing three primary colors: red (R), green (G) and blue (B) in a certain proportion. The RGB model is based on a Cartesian coordinate system, with three axes being R, G, and B. The HSI color model describes colors with hue H, saturation S, and brightness I, where hue and saturation are mainly used to describe color information, while brightness represents the intensity of light. The model has two characteristic...

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Abstract

The invention discloses a documentary archive image compressing method. The documentary archive image method comprises the following steps of: pre-processing, i.e., processing an original image so as to remove noise interference in a scanning process; conducting three-valued processing, i.e., processing the pre-processed image so as to show the pre-processed image by three types of color information; and conducting LL (lossless) compression coding processing, i.e., carrying out lossless compression coding on the image subjected to three-valued processing. By use of the method, all useful information in the documentary archive image is kept, meanwhile redundancies are eliminated and a high compression ratio is obtained.

Description

technical field [0001] The invention belongs to the field of document image processing, and in particular relates to a document file image compression method. Background technique [0002] In order to meet the needs of information construction, a large number of paper documents and files are stored in electronic form after scanning. On the one hand, the contamination caused by improper storage can be avoided; on the other hand, electronic files can be easily managed and searched by using the existing information technology, thus greatly saving manpower and material resources. Usually, the scanned paper archives are stored in the computer in color image format, how to compress the image to save storage space is an urgent problem to be solved. [0003] In recent years, many scholars have studied the image compression problem and proposed various compression coding methods. It is mainly divided into lossless compression coding and lossy compression coding. Among them, the lo...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N1/41H04N19/186
Inventor 吕岳刘丽
Owner EAST CHINA NORMAL UNIV
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