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US 11,450,025 B2Granted
Watermark sensing methods and arrangements
AssigneeDigimarc Corporation
InventorsGeoffrey B. Rhoads, Utkarsh Deshmukh, John D. Lord
Life of this patent
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AssigneeDigimarc Corporation
InventorsGeoffrey B. Rhoads, Utkarsh Deshmukh, John D. Lord
Estimating the term…
The geometric pose of a patch of watermark data is estimated based on the position of a similar, but non-identical, patch of information within a data structure. The information in the data structure corresponds to a tiled array of calibration patterns that is sampled along at least three non-parallel paths. In a particular embodiment, the calibration patterns are sampled so that edges are globally-curved, yet locally-flat. Use of such information in the data structure enables enhanced pose estimation, e.g., speeding up operation, enabling pose estimation from smaller patches of watermark signals, and/or enabling pose estimation from weaker watermark signals. A great variety of other features and arrangements are also detailed.
A method comprising:
A data structure stored on a non-transitory computer readable medium, the data structure comprising 2D template data sampled from a 2D signal, characterized in that samples in one of said dimensions are taken along straight lines, and samples in the other of said dimensions are taken along globally-curved paths, the data structure imparting functionality when employed as a component of a computer system, namely enabling the system to determine both scale and rotation for an excerpt of query 2D data, by determining a position within the template data at which correlation of the excerpt of query 2D data is maximized, wherein coordinates of said position of maximum correlation, within the 2D template data, indicate said scale and rotation.
An apparatus for processing input imagery, comprising:
Dependencies are inferred from the claim text.