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
Memory interface circuit, memory interface method, and electronic device
Preamplifier-to-channel communication in a storage device
Manufacturing method power semiconductor device
Semiconductor device, semiconductor device design method, semiconductor design apparatus, and program
Semiconductor device and method for manufacturing the same
System and method for enhanced transaction payment
  Randomly Featured Patents
Shower head
Document handling apparatus
Grip portion for a writing instrument
Skin sanitizing composition and method of using
Coffee pot press
Method for producing L-threonine, and plasmid and microorganism employed in the same
Identification, cloning, expression, and purification of three novel human calcium-independent phospholipase A.sub.2 family members possessing triacylglycerol lipase and acylglycerol transacyl
Magnetic water softener
Thermoplastic elastomers having improved high temperature performance
Improving glucose tolerance