Image processor and image processing method
AssigneeDigimarc Corporation
InventorGeoffrey B. Rhoads
Life of this patent
Estimating the term…
Abstract
A pattern signal is steganographically encoded in a content object to aid in identifying distortion (e.g., image rotation) to which the object may be subjected. The signal may include a feature that can be used to unambiguously identify correct orientation.
Claims10
An image processor capable of extracting digital watermark information from image data in which said digital watermark information is embedded, comprising:
- rotation information determining means for determining candidate rotation angles of the digital watermark information and associated detection values from the image data with said digital watermark information embedded therein;
- position information determining means for determining a candidate position of the digital watermark information and associated detection value from said image data;
- and determining means for determining the position and rotation angle at which said digital watermark information is embedded in said image data, based on the detection values.
An image processing method of extracting digital watermark information from image data in which said digital watermark information is embedded, comprising:
- determining candidate rotation angles of the digital watermark information and associated detection values from the image data with said digital watermark information embedded therein;
- determining a candidate position and associated detection value from said image data;
- and determining the position and rotation angle at which said digital watermark information is embedded in said image data, based on the detection values.
A computer readable medium on which is stored instructions for performing an image processing method of extracting digital watermark information from image data in which said digital watermark information is embedded, the method comprising:
- determining candidate rotation angles of the digital watermark information and associated detection values from the image data with said digital watermark information embedded therein;
- determining a candidate position and associated detection value from said image data;
- and
- determining the position and rotation angle at which said digital watermark information is embedded in said image data, based on the detection values.
Dependencies are inferred from the claim text.