Methods employing multiple watermarks
First Claim
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1. A watermarking method to mark a security document comprising:
- receiving first information;
receiving second information;
embedding the first information as a first digital watermark in data representing a first portion of the security document;
embedding the second information as a second digital watermark in data representing a second portion of the security document, wherein an original security document comprises both a first digital watermark and a second digital watermark, and wherein the first and second watermarks are provided so as to each react in a different manner when the security document is subjected to a predetermined process.
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Abstract
Image, video, or audio data is encoded with both a frail and a robust watermark. The two watermarks respond differently to different forms of processing (e.g., copying the object may render the frail watermark unreadable), permitting an original object to be distinguished from a processed object. Appropriate action can then taken in response thereto.
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Citations
23 Claims
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1. A watermarking method to mark a security document comprising:
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receiving first information;
receiving second information;
embedding the first information as a first digital watermark in data representing a first portion of the security document;
embedding the second information as a second digital watermark in data representing a second portion of the security document, wherein an original security document comprises both a first digital watermark and a second digital watermark, and wherein the first and second watermarks are provided so as to each react in a different manner when the security document is subjected to a predetermined process. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method of marking an object comprising:
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receiving first information;
receiving second information;
embedding the first information with a first digital watermark in data representing a first portion of the object;
embedding the second information with a second digital watermark in data representing a second portion of the object, wherein at least portions of the first and second watermarks are to be provided with a first ink and a second different ink, respectively, so that the first and second watermarks react in different manners when the object is subjected to a predetermined process. - View Dependent Claims (21, 22, 23)
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Specification