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
Contact sensor, driver device, and care bed
Biaxially oriented film which could be thermally laminated with paper and other substrates
Method and device for managing devices in device management system
Changing a system clock rate synchronously
Owner-brokered knowledge sharing machine
Electrical conduit containing a fire-resisting thermoplastic composition
Image correction method
  Randomly Featured Patents
Auxiliary power system for trucks and other heavy duty vehicles
Method for manufacturing chalcopyrite thin-film solar cell
Plastic packaging material
Method of manufacturing a cable connector assembly
Apparatus and method for multi-mode operation of a flash memory device
Process cartridge for image forming apparatus
Narrow band wavelength division multiplexer and method of multiplexing optical signals
Image sensing apparatus
Seal ring installation tool
Cord reel contacts for a vacuum cleaner