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Method and apparatus for authenticating printed documents using multi-level image comparison based on document characteristics

A technology in images, images, applied in computer parts, character and pattern recognition, instruments, etc.

Active Publication Date: 2011-07-06
KONICA MINOLTA LAB U S A INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The exhaustive image comparison process of the entire image in traditional change detection methods is computationally intensive

Method used

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  • Method and apparatus for authenticating printed documents using multi-level image comparison based on document characteristics
  • Method and apparatus for authenticating printed documents using multi-level image comparison based on document characteristics
  • Method and apparatus for authenticating printed documents using multi-level image comparison based on document characteristics

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Embodiment Construction

[0016] The alteration detection method described here may be implemented by software or firmware stored in a memory and executed by any suitable data processing device such as a computer, printer or scanner having a data processing part. In this regard, computer-executable software encoded to implement the methods described below may be stored in computer memory accessed by a central processing unit (CPU) or microprocessing unit (MPU) of suitable data processing apparatus. A computer is connected to a mass storage device for storing files and other data. The printing and scanning steps can be performed by any printer and scanner or an all-in-one device combining a printing part and a scanning part in a single device. The structures of these devices and devices are well known and will not be described in detail here.

[0017] Embodiments of the present invention provide a file change detection method (also referred to as a file authentication method) based on an image comparis...

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Abstract

The present invention relates to a method and apparatus for authenticating printed documents using multi-level image comparison based on document characteristics. A document authentication method compares a target document image (scanned image) with an original document image at multiple levels, such as block (e.g. paragraph, graphics, image), line, word and character levels. The paragraph level comparison determines whether the target and original images have the same number of paragraphs and whether the paragraphs have the same sizes and locations; the line level comparison determines if the target and original images have the same number of lines and whether the lines have the same sizes and locations; etc. Document segmentation is performed on the target and original images to segment them into paragraph units, line units, etc. for purposes of the comparisons. The original document may be segmented beforehand and the segmentation information stored for later use. The authentication process may be designed to stop when alterations are detected at a higher level, so lower level comparisons are not carried out.

Description

technical field [0001] The invention relates to a method for detecting alterations in printed documents by comparing a scanned image of the document with an original digital version of the document. In particular, the present invention relates to an image comparison method using multi-level comparison based on file characteristics. Background technique [0002] Closed-loop processing refers to printing the original digital document (which may include text, graphics, images, etc.), using the printed hard copy of the document (such as distributing, duplicating, etc.), and then scanning the hard copy of the document back into digital form. Authenticating a scanned digital file refers to determining whether the scanned file is an authentic copy of the original digital file, ie, whether the file in the form of a hard copy has been altered. Various types of file authentication and change detection methods have been proposed. The goal in many file authentication methods is to det...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/68
CPCG06K9/00463G06V30/414
Inventor 明伟田宜彬
Owner KONICA MINOLTA LAB U S A INC
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