Resources Contact Us Home
Decoding message data embedded in an image print via halftone dot orientation

Image Number 19 for United States Patent #8014035.

What is disclosed is a novel system and method for encoding/decoding data in a cover contone image via halftone dot orientation modulation. Arrays of halftone threshold values are used to determine a desired orientation, e.g. 0/ for a given single data value of the original message to be embedded. Message data is embedded as a function of halftone dot orientation. Detection modeling of the print-scan process enables the determination of dot orientation from the image scan via statistically motivated image moments. A probabilistic model of the print-scan channel conditions received moments on input orientation. Density values of the received moments are used to determine dot orientation for each halftone cell. The embedded data is retrieved based on the determined orientations. The present method is applicable to areas of data embedding, document security, and the like.

  Recently Added Patents
Method and apparatus for efficiently inserting fills in an integrated circuit layout
System and method for leveraging independent innovation in entertainment content and graphics hardware
Imidazo[1,2-B]pyridazine and pyrazolo[1 .5-A]pyrimidine derivatives and their use as protein kinase inhibitors
System and method for distributing emergency data messages to public safety answering points in a balanced manner
Sporting goal practice screen
Optical receiver and optical transfer apparatus
Face recognition through face building from two or more partial face images from the same face
  Randomly Featured Patents
Compositions for regulating skin appearance
Door closer assembly for sliding doors
Footwear sole
Optical element, head-up display and method for producing optical element
Process for producing N-(D-.alpha.-methyl-.beta.-mercaptopropionyl)-L-proline and its intermediate
Process and device for room cooling
Rotary printing press having a switchable speed-change gear mechanism with plant gears
Airbag module with a reduced number of fasteners
Method for manufacturing acoustical devices and for reducing especially wind disturbances
In situ extraction of microbial DNA