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Generating a bitonal image from a scanned colour image

A color image, two-tone technology, applied in the field of obtaining high-quality two-tone images, can solve the problems of increasing the image file size, reducing data readability, etc., and achieve high-quality results

Inactive Publication Date: 2009-05-13
EASTMAN KODAK CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, it may still be difficult to provide a fully automated binary scan of every check while obtaining reliably readable information
A large percentage of images corresponding to scanned checks currently contain excessive background residue and noise, which not only reduces data readability but also greatly increases image file size

Method used

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  • Generating a bitonal image from a scanned colour image
  • Generating a bitonal image from a scanned colour image
  • Generating a bitonal image from a scanned colour image

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Embodiment Construction

[0048] The description is particularly directed to elements forming part of, or cooperating more directly with, an apparatus according to the invention. It is to be understood that elements not specifically shown or described may take various forms well known to those skilled in the art.

[0049] Using the method of the invention, a color scan of a document is obtained and values ​​obtained from the scanned image data are used to generate an enhanced bitonal image with reduced noise content. The color scan data is first used to identify objects or regions of interest on the document and the most probable color of text or other image content within each region. The foreground objects of interest and the color content of the background are then detected within each region of interest. The color scan data indicating the intensity or density corresponding to a certain color channel is then analyzed and used to generate a High Contrast Object Gray Scale (HCOGS) image. Edge detect...

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Abstract

A method for obtaining bitonal image data from a document obtains scanned color image data from at least two color channels and identifies, in the scanned color image data, at least one region of interest (R 1 ) containing foreground content and background content. At least one threshold data value is obtained according to an image attribute that differs between the foreground content and the background content within the region of interest (R 1 ). The scanned color image data of the document is converted to bitonal image data according to the at least one threshold data value obtained from the region of interest (R 1 ).

Description

technical field [0001] The present invention generally relates to image thresholding (thresholding) and the separation of foreground and background images, and more particularly, the present invention relates to a method for obtaining high-quality bitonal image (bitonal image) from documents with a lot of background color content. )Methods. Background technique [0002] In a production scanning environment, binary (black and white) forms are often used to represent and store digitally scanned paper documents due to their greater storage and transmission efficiency, especially for text images. output. The binary form is also well suited for text scanning and optical character recognition (OCR). [0003] Generally, a document is scanned using a scanner to obtain a digital grayscale signal of 8 bits per pixel from a charge-coupled device (CCD) sensor. Converting this 8-bit-per-pixel grayscale data to 1-bit-per-pixel binary data would then require some type of image threshold...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N1/403G06K9/38G06V10/28
CPCG06K9/38H04N1/403H04N1/40012G06V10/28
Inventor 李永权G·A·海吉斯M·C·阿萨卡
Owner EASTMAN KODAK CO
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