Hiding information to reduce or offset perceptible artifacts
AssigneeDigimarc Corporation
InventorAlastair M. Reed
Life of this patent
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Abstract
The present invention relates to digital watermarking. In a preferred embodiment, a multi-channel media signal is embedded with first and second digital watermark components. The first component is embedded in a first of the channels and a second component is embedded in a second of the channels. The second component is registered with the first component so as to reduce visible attributes that are attributable to the first component.
Claims27
A method of embedding first and second digital watermark components in a signal having a plurality of color channels, said method comprising:
- embedding the first digital watermark component in a first of the plurality of color channels;
- and
- embedding the second digital watermark component in a second of the plurality of color channels,
- wherein the second digital watermark component is embedded in the second of the plurality of color channels so as to offset perceptible artifacts that are associated with the first digital watermark component in the first channel.
A method of embedding a steganographic signal in an image, wherein the image comprises a first color plane, a second color plane, and a third color plane, said method comprising:
- embedding a steganographic signal in the first color plane and in the second color plane, wherein the embedding affects a first spatial region of the image in both the first color plane and the second color plane;
- embedding a steganographic signal in the third color plane, wherein the embedding in the third color plane affects the first spatial region so as to reduce visual artifacts that are attributable to the embedding in the first and second color planes.
A method of reducing visual artifacts that are attributable to embedding steganographic components in media, wherein the media includes a plurality of channels, said method comprising:
- embedding a first steganographic component in a first color channel, wherein the embedding in the first channel affects a first pixel region;
- and
- embedding a second steganographic component in a second channel, wherein the embedding in the second channel affects a second pixel region, and
- wherein the first and second pixel regions spatially correspond to one another.
A method of offsetting perceptibility of a digital watermark component in a signal, said method comprising:
- embedding a first digital watermark component in the signal so as to affect a first color;
- and
- embedding at least a second digital watermark component in the signal so as to affect a first color,
- wherein the second digital watermark component is embedded in the signal so as to offset perceptibility of the first digital watermark component.
Dependencies are inferred from the claim text.