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US 7,068,812 B2Granted
Decoding hidden data from imagery
AssigneeDigimarc Corporation
InventorsRobert D. Powell, Mark Nitzberg
Life of this patent
Estimating the term…
Abstract
A digital image in which hidden information has been encoded, is processed to discern the hidden information. This processing can include identifying geometric distortions of the image (e.g., cropping, scaling, rotation), and compensating for such identified distortions.
Claims20
A method of processing image data to recover hidden information, comprising:
- discerning, from said image data, a message hidden therein, said discerning including performing an algorithmic registration process to resolve an initially unknown variable needed to discern the message from the image data, said image data corresponding to an encoded image corrupted by a geometrical transformation process, wherein the message is discerned notwithstanding said geometrical image transformation.
A method of processing image data to recover digital data hidden therein, comprising:
- geometrically transforming said image data to correspond to reference image data;
- determining a difference pattern between the geometrically-transformed image data and said reference image data;
- and
- processing the difference pattern to decode digital data encoded therein.
1 more element
Dependencies are inferred from the claim text.