Detecting information hidden out-of-phase in color channels Number:6,804,377 from the United States Patent and Trademark Office (PTO) owispatent

Title: Detecting information hidden out-of-phase in color channels

Abstract: The present invention relates to detecting 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. For detection, the embedded media is illuminated with infrared light, which emphasizes the black color plane. An input device captures a digital image of the illuminated media. The image is detected or displayed based on the emphasized black plane.

Patent Number: 6,804,377 Issued on 10/12/2004 to Reed,   et al.

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Inventors:	Reed; Alastair M. (Lake Oswego, OR); Brundage; Trent J. (Tigard, OR); Cattone; Jeremy (Tigard, OR)
Assignee:	Digimarc Corporation (Tualatin, OR)
Appl. No.:	10/115,441
Filed:	April 2, 2002

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Current U.S. Class:	382/100 ; 358/3.28; 713/176
Field of Search:	382/100,162,163,115,112,135,137,138,140,139,183,232,306,321 358/3.28,537-539 380/54,232 705/51,54 713/176 348/661,660

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References Cited [Referenced By]

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