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
Systems and methods for generating a hybrid text string from two or more text strings generated by multiple automated speech recognition systems
VGPU: a real time GPU emulator
Systems and methods for port mirroring with network-scoped connection-oriented sink
Systems, methods, and devices for selling transaction instruments via web-based tool
Techniques for generating and displaying a visual flow of user content through a social network
Radiation detector array
Round carrying case
  Randomly Featured Patents
Skate sharpening machine and method
Computation-conserving traffic data transmission method and apparatus
Flat soft magnetic material and process for its production
Manufacturing method of organic flat light-emitting devices
High-temperature wear-resistant sintered alloy
Method of manufacturing flanged shafts
Sheet carrying apparatus
Print screen frame assembly and method of making
Exercise pouch
Liposome encapsulation of chelating agents