Image marking adapted to the image
First Claim
1. In a method of encoding an image to convey secret information, the method including receiving image data and information to be encoded, and changing the image data to effect encoding, an improvement comprising adapting the encoding to contents of a particular image, wherein the secret information is distributed differently among image components of different first and second images.
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Abstract
A digital image is processed to hide information, by generally inconspicuous adjustments of pixel values. Desirably, the processing is adapted to the particular image being encoded, so as to better conceal the encoding. The method may include determining a relative ability of a pixel to be adjusted inconspicuously, by reference to values of at least two neighboring pixels.
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Citations
35 Claims
- 1. In a method of encoding an image to convey secret information, the method including receiving image data and information to be encoded, and changing the image data to effect encoding, an improvement comprising adapting the encoding to contents of a particular image, wherein the secret information is distributed differently among image components of different first and second images.
- 13. In a method of encoding an image to convey secret information, the method including receiving image data and information to be encoded, and changing the image data to effect encoding, an improvement comprising adapting the encoding to the particular image, wherein the strength of the encoding varies in accordance with particular features of the image.
- 16. In a method of processing image data to hide information therein, the information comprising more than a single bit, the method including adjusting values of pixels represented by said image data to encode a representation of the information in the image data, an improvement comprising determining a relative ability of a pixel to be adjusted inconspicuously, by a method that takes into account values of at least two neighboring pixels.
- 24. In a method of processing image data to hide information therein, the information comprising more than a single bit, the method including adjusting values of pixels represented by said image data to encode a representation of the information in the image data, an improvement comprising determining a relative ability of a pixel to be adjusted inconspicuously by reference to a difference between first and second parameters, where said parameters are functions of values of neighboring pixels.
- 26. In a method of processing image data to hide information therein, the information comprising more than a single bit, the method including changing values of pixels represented by said image data to encode a representation of the information in the image data, an improvement comprising receiving a parameter corresponding to a pixel, said parameter being a function of values of first and second pixels adjoining said pixel, and using said received parameter in adapting the encoding to the image.
- 29. In a method of processing image data to hide information therein, the information comprising more than a single bit, the method including changing values of pixels represented by said image data to encode a representation of the information in the image data, an improvement comprising receiving plural parameters, one for each of several different regions of the image, each parameter relating to the relative ability of said region to be altered without conspicuously changing the image, each parameter being a function of plural pixels values, the method further including using said received parameters in adapting the encoding to the image.
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32. A method of encoding an image to convey binary data in the image by making changes to the image that are inconspicuous, the method comprising:
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distributing the binary data among pixels in the image according to a random pattern; and encoding the binary data in the image by making changes to the image as a function of image values, the encoding being dependent on characteristics of the image that make the changes inconspicuous. - View Dependent Claims (33, 34)
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35. A method of encoding an image to convey binary data in the image by making changes to the image that are inconspicuous, the method comprising:
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distributing the binary data among pixels in the image according to a pattern; and encoding the binary data in the image by making changes to the image as a function of image values such that strength of encoding varies with features in the image, the encoding being dependent on features of the image that make the changes inconspicuous.
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Specification