Resources Contact Us Home
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
Mobile computing terminal
Electronic document reading devices
Lateral flow test kit and method for detecting an analyte
Linear book scanner
Semiconductor unit having a power semiconductor and semiconductor apparatus using the same
Controlling access to resources on a network
Distylium plant named `PIIDIST-II`
  Randomly Featured Patents
Enriched search features based in part on discovering people-centric search intent
Fiber cement shingle plank assembly
Selective chlorination of steroids and other substrates directed by covalently linked pyridine derivatives acting as templates
Nut and bolt sizing tool
Apparatus for operating a front door of a VCR
Double-heterostructure semiconductor with mesa stripe waveguide
Method and apparatus for forming multi-layered circuits using liquid crystalline polymers
Binary tree method for multi-tag anti-collision
System and method for providing routing, mapping, and relative position information to users of a communication network
Electroplating aluminum stock