Resources Contact Us Home
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
Image forming device
Flip-chip mounting resin composition and bump forming resin composition
Image forming apparatus
Antenna arrangement and antenna housing
Self-assembled, micropatterned, and radio frequency (RF) shielded biocontainers and their uses for remote spatially controlled chemical delivery
Biodegradable aliphatic-aromatic copolyester for use in nonwoven webs
  Randomly Featured Patents
Clotting cascade initiating apparatus and methods of use and methods of closing wounds
Blade for blade exchangeable razor
Fuel tank system
Pickup device
Fuel assembly structure selectively using channel and coolant rod for load support and method
Trampoline system with plural beds
Modular lighting system and lighting arrangement
Constant-voltage power supply circuit
Process for preparing injection-purpose fluorocarbon emulsion capable of carrying oxygen
Method of forming tire with a profiled innerliner