Method and apparatus for preventing removal of embedded...

G - Physics – 11 – B

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

G11B 20/00 (2006.01) H04N 5/913 (2006.01)

Patent

CA 2319737

Apparatus and methods are provided for embedding watermark information into a cover signal (2), such as an audio signal, video signal, or still image signal, in a manner that prevents the watermark information from being removed without degrading the quality of the cover signal. This is accomplished by subjecting the cover signal to a phase modulation (6) prior to being embedded with the watermark information (8), wherein the amount or degree of phase modulation is changed (3, 5) at least for each different watermark to be embedded in a particular instance or copy of the cover signal. As such, if two copies of the same cover signal, each containing a different watermark, are averaged or combined in an attempt to obliterate the watermark information, the cover signal will be subjected to phase cancellation, rendering any illicit copy of such signal so derived to be valueless.

La présente invention concerne un appareil et des procédés permettant d'intégrer des informations en filigrane dans un signal de couverture (2), tel qu'un signal audio, un signal vidéo ou un signal d'image fixe, de façon que l'on ne peut effacer les informations en filigrane sans détériorer le signal de couverture. Selon la présente invention, on soumet le signal de couverture à une modulation de phase (6) avant d'y intégrer les informations en filigrane (8), la quantité ou le degré de modulation de phase étant modifié (3,5) au moins pour chaque filigrane différent devant être intégré dans un exemplaire ou une copie du signal de couverture. Par conséquent, si deux copies d'un même signal de couverture, chacune contenant un filigrane différent, sont moyennées ou combinées dans le but d'effacer les informations en filigrane, le signal de couverture subira une annulation de phase qui rendra inutilisable toute copie illicite de ce signal.

LandOfFree

Say what you really think

Search LandOfFree.com for Canadian inventors and patents. Rate them and share your experience with other people.

Rating

Method and apparatus for preventing removal of embedded... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and apparatus for preventing removal of embedded..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for preventing removal of embedded... will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFCA-PAI-O-1887506

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.