Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
System and method of retrieving a watermark within a signal










Image Number 3 for United States Patent #7529941.

A system and method of retrieving a watermark in a watermarked signal are disclosed. The watermarked signal comprises odd and even overlapped blocks where the watermark is contained in the even blocks. The method comprises, for each k-th even block, subtracting the two adjacent odd numbered blocks from the k-th even block of the watermarked signal to retrieve s*.sub.k(n), transforming s*.sub.k(n) into the frequency domain to generate S.sub.k(f), calculating a phase of S.sub.k(f) as .phi.(f) and a phase of S.sub.k(f) as .phi.(f), calculating the difference .PSI.(f) between .phi.(f) and .phi.(f), unwrapping .PSI.(f) to obtain the phase modulation {tilde over (.phi.)}.sub.k(f), and using a Viterbi search to retrieve the watermark embedded in {tilde over (.PHI.)}.sub.k(f).








 
 
  Recently Added Patents
System and method for interactive image-based modeling of curved surfaces using single-view and multi-view feature curves
System and method for managing self-refresh in a multi-rank memory
Stable nanoemulsions for ultrasound-mediated drug delivery and imaging
Mineral, nutritional, cosmetic, pharmaceutical, and agricultural compositions and methods for producing the same
Integrated circuit with electromagnetic intrachip communication and methods for use therewith
Milk frother
Switchgear and method for operating switchgear
  Randomly Featured Patents
Canister, transport, storage, monitoring, and retrieval system
Universal connector for downspout drainage extensions
Power-up signal generation circuit
Computer power down upon emergency network notification
Imaging apparatus equipped with automatic recirculating document handler, and sheet-circulating feeder
Method and apparatus for dispensing material on a substrate
Displaying method in information processing apparatus that permits execution of either object or task oriented processings
Electron beam welding gun
Bi-directional data mapping tool
Algometer with pressure intensification rate adjusting and control capabilities