Patent ID: 11875485
Assignee: DIGIMARC CORPORATION
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 5:
6. A non-transitory computer readable medium on which is stored instructions, which when executed by a processor, perform a method of reading an embedded digital payload in an image, the method comprising:
obtaining an image;
transforming the image into a first domain for evaluating geometric distortion of a two-dimensional (2D) signal;
for a first set of geometric transform candidates, applying a least squares process that produces first refined geometric transform candidates from the first set having detection metrics for the 2D signal that satisfy predetermined criteria;
evaluating geometric transform candidates on a rotation and scale mapping of the image and producing second refined geometric transform candidates having detection metrics for the 2D signal that satisfy predetermined criteria;
selecting a refined candidate geometric transform from the first refined geometric transform candidates and the second refined geometric transform candidates based on detection metrics; and
using the refined candidate geometric transform to extract a plural-bit payload from the 2D signal.