Hiding information out-of-phase in color channels
First Claim
1. A method of steganographically hiding a first image in a second image, the second image comprising at least a cyan (C) color channel, a magenta (M) color channel, a yellow (Y) color channel and a black (K) color channel, said method comprising the steps of:
- providing a first set of signal modifications corresponding to the first image;
modifying the K color channel with the first set of signal modifications;
providing a second set of signal modification corresponding to the first image, the second set of signal modifications being inverted with respect to the first set of signal modifications; and
modifying the C, M and Y color channels with the second set of signal modifications.
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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.
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Citations
20 Claims
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1. A method of steganographically hiding a first image in a second image, the second image comprising at least a cyan (C) color channel, a magenta (M) color channel, a yellow (Y) color channel and a black (K) color channel, said method comprising the steps of:
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providing a first set of signal modifications corresponding to the first image;
modifying the K color channel with the first set of signal modifications;
providing a second set of signal modification corresponding to the first image, the second set of signal modifications being inverted with respect to the first set of signal modifications; and
modifying the C, M and Y color channels with the second set of signal modifications. - View Dependent Claims (2, 3, 4)
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5. A method of embedding a digital watermark component in a signal having a plurality of channels, said method comprising the steps of:
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embedding the digital watermark component in a first of the plurality of channels; and
embedding the digital watermark component in a second of the plurality of channels to be out-of-phase with respect to the digital watermark component in the first channel. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 15, 17, 18, 19, 20)
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14. A method of hiding a first image in a second image comprising:
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converting the first image to a black channel image;
selecting a location in the second image to hide the black channel image;
modifying the black channel in the selected location to accommodate the black channel image;
providing in terms of at least cyan, magenta and yellow channels a color channel image that is inverted with respect to the black channel image;
modifying the cyan, magenta and yellow channels in the selected location to accommodate the color channel image.
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16. A method of steganographically embedding a bar code in an image, the image including at least a black channel and at least a color channel, said method comprising the steps of:
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converting the barcode into a set of grayscale values;
in at least one region of the image, modifying the black channel in the region to accommodate the set of grayscale values;
inverting the grayscale values in the set; and
modifying the color channel in the region to accommodate the inverted grayscale values in a manner so that the modified black channel region is inverted with respect to the modified color channel.
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Specification