Enhancing embedding of out-of-phase signals

Details Enhancing embedding of out-of-phase signals Enhancing embedding of out-of-phase signals

2005-06-28

2005-06-28

Patel, Kanjibhai (Department: 2625)

Image analysis

Applications

C382S162000

Reexamination Certificate

active

06912295

ABSTRACT:
The present invention relates to steganographically hiding images and information. In a preferred embodiment, an image is hidden within a media signal. The media preferably includes a cyan (C) color plane, a magenta (M) color plane, a yellow (Y) color plane and a black (K) color plane. In an alternative embodiment, the media includes a spot color. The image is converted into a black color channel image and is then applied to the media's K channel. The black channel image is inverted and the inverted image is applied to the media's CMY (or spot) color planes. The C, M and/or Y channels can be investigated to determine whether the image's signal level should be modified. In a related embodiment, the media signal is segmented into a plurality of blocks and the detection level of a first embedded block is determined to be sufficient before the embedding continues to a second block. In still another embodiment, visible spectrum detection of our out-of-phase digital watermark provides a clue as to whether a printing process needs calibration or is misaligned.

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