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
Particulate filter with hydrogen sulphide block function
Stacked structure and stacked method for three-dimensional chip
Capacity and coverage self-optimization method and device in a mobile network
Enabling improvement in cellular network coverage
Cartridge for separating analyte from mixture, comprising dispensing and receiving chambers and insert
Method for manufacturing light emitting diodes
Storing a location within metadata of visual media
  Randomly Featured Patents
Volume and failure management method on a network having a storage device
3-Halo cephalosporins
Cake holder
Method and system for reading images with a movable light intercepting plate
Cookbook holder
Multiple ply tissue products having enhanced interply liquid capacity
Heating sheet having far infrared radiator attached and various equipments utilizing heating sheet
Logic-circuit layout pattern inspection method and logical simulation
Magnetic tape cartridge having self docking leader block
Air assist fuel injectors