초록 ▼

A system, method, and product provide distortion compensation when watermarking a host signal with a watemark signal. The watermark signal includes watermark-signal components having watermark-signal values, and the host signal includes host-signal components having host-signal values. A system incl

A system, method, and product provide distortion compensation when watermarking a host signal with a watemark signal. The watermark signal includes watermark-signal components having watermark-signal values, and the host signal includes host-signal components having host-signal values. A system includes 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. Also included is an embedding value generator that generates embedding values by each embedding generator. The system also has a point coder that sets at least one host-signal value of one or more selected host-signal components to a first embedding value to form a composite-signal value. A distortion compensator modifies at least one composite signal value. The distortion compensator includes a difference signal generator that generates a difference signal component having a first difference-signal value that is the difference between a host-signal value and its corresponding composite-signal value. The distortion compensator also includes a difference signal processor that scales the difference-signal value by a scaling factor, A distortion compensation combiner then generates a distortion-compensated composite signal based on the scaled difference-signal value and the composite-signal value. The distortion compensator may modify the composite signal value based on the number of possible watermark signal values to be embedded, a watermark-induced distortion level, an expected channel-induced distortion level, and a reliability of extracting the watermark signal.

대표청구항 ▼

1. 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

1. 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.