Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Marking images of text with speckle patterns for theft deterrence










Image Number 8 for United States Patent #8023159.

The present invention provides methods and apparatus for embedding an identifying pattern of visible speckles into the digitized image of each page of a document. A speckle is a cluster of black or white pixels. Speckles are printed as black speckles on the white paper, or conversely, as areas of missing black removed from the black text characters, called white speckles. The collective pattern of all embedded black and white speckles on a single document page is called a specklemark. A specklemark can survive contrast manipulations on photocopiers and binary rasterization done by fax scanning prior to data transmission. The random pattern of the black and white speckles visible in the digitized image of a document page can be detected automatically, and by systematically matching the detected pattern with those known to have been embedded into marked copies of a document page, a specific document copy can be identified. Methods for composing, embedding and detecting specklemarks are the subject of this patent.








 
 
  Recently Added Patents
Stain-blocking aqueous coating composition
Visualization of information associated with applications in user interfaces
Contact lens material
Vehicle seating system and method for reducing fatigue with changing actuator movement
Ion generation using wetted porous material
Case
Battery pouch sheet edge insulation
  Randomly Featured Patents
Monoclonal antibodies and their use
Clutch cover assembly
Method for automatic manufacture of and printing on astigmatic contact lenses and apparatus therefor
Immunoassays in capillary tubes
Adaptive memory control
Chemical products and methods
Chair
Diamond cut
Coal liquefaction complex with minimal carbon dioxide emissions
Transmission arrangement, in particular a maltese transmission arrangement