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
Semiconductor device
Communication terminal, communication system, server apparatus, and communication connecting method
Measuring apparatus for measuring a physical property of a sample
System and method of creating and providing SMS http tagging
Methods and devices for coding and decoding images, computer program implementing them and information carrier enabling their implementation
Method of producing probabilities of being a template shape
Battery structures and related methods
  Randomly Featured Patents
Electrically tunable liquid crystal lens set with central electrode
Electrophotographic photoreceptor
Convertible van
Standby tray having curl correction
Platform lift
Combined bottle and cap
Method of transferring Bloch lines in the domain wall of a magnetic domain, and a magnetic memory using the method
Method and apparatus for reducing code size by executing no operation instructions that are not explicitly included in code using programmable delay slots
Repeatable ESD protection utilizing a process for unshorting a first shorting material between electrical pads and reshorting by recreating the short
Gas turbine engine fan bleed heat exchanger system