Method, system and data support for video watermarking, method and system for extracting this watermaking

摘要

Movement vectors (12) are estimated (10) from a video signal (S) and reduced (14) to a smaller number of higher level vectors (16). A further vector selection (20) is made using a secret key or mask (18). These vectors and their dependants are modified (22,25) by adding a component which depends on the tattooing function and a marking key. The result (26) with original movement vectors produce a new matrix (28) and signal (S') Independent claims are also included for the following : (1) an equipment for tattooing a video signal according to the method, (2) means for storing a tattooed video signal using the method, (3) a method for extracting tattooing from a video signal obtained by the method, (4) an equipment for extracting tattooing using the method for extracting tattooing.