Patent ID: 6400826
Filing Date: 2002-06-04
Classification: G06T,G11B,H04H,H04N

Abstract:
A system that watermarks a host signal with a watermark signal, the watermark signal comprising watermark-signal components, each having one of a plurality of watermark-signal values, and the host signal comprising host-signal components, each having one of a plurality of host-signal values, the system comprising:an ensemble designator that designates a plurality of embedding generators, each corresponding to a single watermark-signal value of a co-processed group of one or more watermark-signal components; an embedding value generator that generates, by each embedding generator, a plurality of embedding values, the total of each plurality of embedding values comprising a first embedding-value set, wherein at least one embedding value generated by a first embedding generator is not the same as any embedding value generated by a second embedding generator; a point coder that sets at least one host-signal value of one or more selected host-signal components to a first embedding value of a third embedding generator, thereby forming a composite-signal value, wherein the third embedding generator corresponds to a first watermark-signal value of the group of co-processed watermark-signal components, and wherein at least one embedding interval of one embedding generator is not the same as any embedding interval of at least one other embedding generator; and a distortion compensator that modifies at least one composite signal value, thereby forming a distortion-compensated composite signal value of a distortion-compensated composite signal component, wherein the distortion-compensated composite signal value has a distortion with respect to the at least one host signal value that is less than a distortion of the at least one composite signal value with respect to the at least one host signal value.