Tuesdays the PTO issues new patents. Both of today's Spotlight Patents concern aspects of digital fingerprinting. Assigned to Dolby, the first patent addresses techniques for projection based hashing that balances robustness and sensitivity of media fingerprints. Assigned to Digimarc, the second patent addresses techniques for generating and utilizing content signatures.
8,542,869, "Projection based hashing that balances robustness and sensitivity of media fingerprints," assigned to Dolby Laboratories Licensing Corporation.
Multiple candidate feature components of media content or projection matrices (or other hash functions, e.g., non-linear projections) are identified. Each of the candidate projection matrices (or other hash functions) includes an array of coefficients that relate to the candidate features. A subgroup of the candidate features or the projection matrices (or other hash functions) are selected based at least partially on an optimized combination of at least two characteristics of the candidate features or projection matrices (or other hash functions). Media fingerprints that uniquely identify the media content are derived from the selected optimized subgroup. Optimal projection matrices (or other hash functions) may be designed. Performance or sensitivity (e.g., search time) characteristics of the fingerprints are thus balanced with robustness characteristics thereof.
8,542,870, "Methods, apparatus and programs for generating and utilizing content signatures," assigned to Digimarc.
The presently claimed invention generally relates to deriving and/or utilizing content signatures (e.g., so-called "fingerprints"). One claim recites a method of generating a fingerprint associated with a content item including: pseudo-randomly selecting a segment of the content item; and utilizing a processor or electronic processing circuitry, fingerprinting the selected segment of content item as at least an identifier of the content item. Of course, other claims and combination are provided as well.