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
Glass or glass-ceramic pane reflecting infrared radiation
Scalable security services for multicast in a router having integrated zone-based firewall
Decrementing settings for a range of power caps when a power cap is exceeded
Data latch circuit and electronic device
Sitagliptin intermediate compounds, preparation methods and uses thereof
Dynamic report mapping apparatus to physical data source when creating report definitions for information technology service management reporting for peruse of report definition transparency a
Look up table (LUT) structure supporting exclusive OR (XOR) circuitry configured to allow for generation of a result using quaternary adders
  Randomly Featured Patents
Device and method for processing a slaughtered animal
Conductive resin compositions and electronic parts using the same
Secure stamping of multimedia document collections
Process control apparatus and method for adjustment of operating parameters of controller of the process control apparatus
Capacitors adapted for acoustic resonance cancellation
Critical area cost disposition feedback system
Hydroforming process and apparatus for the same
Electronic package
Attenuation spot filters and manufacturing process
Washer for securing electrical conduction at connections