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Method and device for raising digital picture quality

A digital image, quality technology, applied in image enhancement, image communication, image data processing and other directions, can solve problems such as uncomfortable display

Inactive Publication Date: 2004-05-12
HEWLETT PACKARD DEV CO LP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Thus, the final display may be uncomfortable for the observer's eyes

Method used

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  • Method and device for raising digital picture quality
  • Method and device for raising digital picture quality
  • Method and device for raising digital picture quality

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Embodiment Construction

[0024] Reference will now be made in detail to embodiments of the invention, the embodiments of which will be described in the accompanying drawings, wherein like reference numerals are used to refer to like elements throughout. The embodiments are described below in order to explain the present invention by referring to the figures.

[0025] figure 2 is a flowchart illustrating a method of improving digital image quality according to an aspect of the present invention. The method includes: in operation 410, selecting a pixel as a relevant pixel of an image; in operation 210, converting the color data of the relevant pixel; in operation 220, updating history information according to the pixel type of the relevant pixel; In 230, the block feature type of the relevant pixel is determined; in operation 240, the type of the region to which the relevant pixel belongs is determined; in operation 250, the image quality of each region is improved; and in operation 460, the final pix...

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Abstract

A digital image quality enhancing method that enhances a quality of a document image comprising pixels with a predetermined resolution and obtained by scanning a script comprising a combination of a background, a text, and an image. The method includes: updating history information according to a pixel type of a concerned pixel using previous history information of the concerned pixel; determining a block feature type of the concerned pixel using the pixel type and the updated history information of the concerned pixel; determining a type of an area to which the concerned pixel belongs based on a second type of a second area to which a first neighbouring pixel in a left direction of the concerned pixel belongs, a third type of a third area to which a second neighbouring pixel in a line above the concerned pixel belongs, the pixel type of the concerned pixel, and the determined block feature type; and performing different image quality enhancing processes based on the determined area type.

Description

[0001] This application claims priority to Korean Patent Applications Nos. 2002-49699 and 2002-65516 filed with the Korean Intellectual Property Office on Aug. 22, 2002, and Oct. 25, 2002, respectively, the entire disclosures of which are hereby incorporated by reference . technical field [0002] The present invention relates to a method and a device for improving the quality of a digital image, and more particularly, to a method and a device for improving the quality of a digital image: by means of the method and the device, a file obtained by scanning a document containing a combination of text and image The document image is divided into a text area, a background area, a halftone image area, and a continuous tone image area, and then the image quality of each area is increased appropriately to obtain an improved image quality display. Background technique [0003] In general, interest in techniques for efficiently representing an original document using only black and wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/20G06T5/00H04N1/40
CPCG06K9/00456H04N1/40062G06T5/004G06V30/413G06T5/75
Inventor 李钟贤
Owner HEWLETT PACKARD DEV CO LP