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Method and device used for removing background colors from image

An image processing device and image technology, applied in image communication, electrical components, etc., can solve problems such as poor performance

Inactive Publication Date: 2011-05-25
HEWLETT PACKARD DEV CO LP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When copying "blueprints" (e.g. using a multifunction printer), it is often desirable to remove the blue background; however, prior art image processing methods for background color removal do not perform well when applied to blueprints

Method used

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  • Method and device used for removing background colors from image
  • Method and device used for removing background colors from image
  • Method and device used for removing background colors from image

Examples

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Embodiment Construction

[0013] An embodiment of the invention for removing background color from an image is described below in connection with blueprint copying using a multifunction printer; however, it should be understood that the invention can be applied to remove background color from any image, regardless of the image's origin , and the invention is not limited to blueprint image processing or multifunction printers. The device used to realize the image background color removal method of the present invention can be single or distributed.

[0014] figure 1 A copy of a blueprint 11 is broadly illustrated using a multifunction printer 10 embodying the invention arranged to remove the blue background present in the original blueprint 11 and to produce an output document 12 with a white background (assuming a white print medium is used) ).

[0015] The multifunction printer 10 includes:

[0016] - a scanner unit 15 for scanning a document such as a blueprint 11 to generate a corresponding input...

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Abstract

A method and a device used for removing background colors from an image is provided, which removes background colors via processing an image in a colorimetric space. After determination (22) of a colorimetric value of background colors of the image, calculate (23) a color adaptation transform used for transforming the background color colorimetric value into a target color spot, the target color spot is usually a white spot. Then apply (24) the calculated color adaptation transform into the image.

Description

technical field [0001] The present invention relates to methods and apparatus for removing background color from images, and more particularly, but not exclusively, to removing background color from images of blueprints. Background technique [0002] It is often desirable to remove background color from an image, for example, to improve clarity when photocopying an original document produced on a colored medium. [0003] Various methods are known for removing background color from images, and one such prior art method is described in US Patent 7,085,413. The method disclosed in this patent involves using the RGB histogram of the image to identify the background color, after which adjustments are made to the background color entry in the mapping table used to convert RGB input to CYMK output; the adjustments are made to cause the RGB background color to be in the The CYMK output color space is mapped to white. [0004] One type of document that has proven particularly probl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N1/60
Inventor M・玛丽亚M・A・罗佩斯
Owner HEWLETT PACKARD DEV CO LP
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