The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 04, 2010
Filed:
Apr. 19, 2005
Timothy Merrick Long, Lindfield, AU;
Peter Alleine Fletcher, Rozelle, AU;
Stephen James Hardy, West Pymble, AU;
Timothy Merrick Long, Lindfield, AU;
Peter Alleine Fletcher, Rozelle, AU;
Stephen James Hardy, West Pymble, AU;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An anti-tampering method for processing documents is disclosed. The method comprises, in regard to an encoding step, the steps of resolving (in a step) in regard to an N-level image to be recorded, a pixel of the image into a major component having N possible values, selecting (in the step) a pattern element depending upon the major component and the position of the pixel in the image, and recording the selected pattern element (in a step) onto a transfer medium. In regard to a corresponding decoding step the method comprises extracting (in a step) from the recorded document, a retrieved pattern element for said pixel, determining a pattern element (in a step) depending upon a major component extracted from the retrieved pattern element and the position of the pixel on the recorded document, and comparing (in a step) the retrieved pattern element and the said determined pattern element.
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