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AssigneeDigimarc Corporation
InventorsAlastair M. Reed, Trent J. Brundage, Jeremy Cattone
Estimating the term…
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.
A method to detect a first image hidden in a second image, the second image comprising a plurality of color channels, wherein the hiding of the first image in the second image comprises at least hiding a first image component in a first of the plurality of color channels, and in the same second image location, hiding the component in a second of the plurality of channels, the second channel component being inverted with respect to the first channel component, said method comprising the steps of:
A method to detect a digital watermark embedded in media, wherein the media includes a plurality of color planes and the digital watermark includes at least a first component and a second component, wherein the second component is embedded in a second color plane at a first media location so as to be inverted in the same media location with respect to the first component embedded in a first color plane so as to cancel luminance attributable to the first component, said method comprising the steps of illuminating the media with infrared light or ultraviolet light, and detecting the digital watermark from the illuminated media.
A method to detect a digital watermark embedded in at least a first of a plurality of color planes, and embedded in a second color plane in an inverted manner with respect to the first plane, said method comprising the steps of:
A method of detecting an orientation fiducial steganographically hidden in a second image to help resolve image distortion, the second image comprising a plurality of color channels, wherein the hiding of the orientation fiducial in the second image comprises hiding the fiducial in a first of the plurality of color channels, and hiding the fiducial in a second of the plurality of channels at the same location as the hidden first channel fiducial, the second channel fiducial being inverted with respect to the first channel fiducial so as to cancel localized luminance attributable to the first channel fiducial, said method comprising the steps of illuminating the second image with infrared light, capturing a digital image of the illuminated second image, and analyzing the captured illuminated digital image to detect the fiducial.
Dependencies are inferred from the claim text.