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Detection of document security marks using run profiles

  • US 20070041628A1
  • Filed: 08/17/2005
  • Published: 02/22/2007
  • Est. Priority Date: 08/17/2005
  • Status: Abandoned Application
First Claim
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1. A method of digital image processing for a printed document potentially including a security mark defined by a plurality of actual mark constituents each having a known color, size, shape, and run profile, and said actual mark constituents having a select spatial arrangement relative to each other, said method comprising:

  • (a) scanning said printed document to obtain digital image data corresponding to said printed document, said digital image data defined in terms of a plurality of color input pixel values;

    (b) processing said digital image data to identify all portions representing potential mark constituents of a security mark, wherein said processing comprises;

    (i) determining a run profile for features represented in said digital image data;

    (ii) comparing said run profile for each feature to the known run profile of an actual mark constituent to identify suspect components, wherein only features having said known run profile are identified as suspect components; and

    , (iii) examining each suspect component to identify any suspect components that are potential mark constituents;

    (c) for each potential mark constituent represented by said digital image data, determining if said potential mark constituent, together with at least one other potential mark constituent represented by said digital image data, defines a potential security mark;

    (d) for each potential security mark represented in said digital image data, determining if said potential security mark represents an actual security mark present in said printed document.

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