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

Claim 0:
1. A reader device comprising:
a camera operable to capture an image;
memory configured to store the image from the camera;
means for converting the image in the memory into a first domain for evaluating an embedded signal to determine a geometric transform of the embedded signal;
means for evaluating a first set of geometric transform candidates by using the first set of geometric candidates as seeds to a least squares process and producing a first set of refined geometric transform candidates with detection metrics;
means for evaluating a second set of geometric transform candidates by applying a correlation process on a rotation and scale mapping of the image and producing a second set of refined geometric transform candidates with detection metrics;
means for selecting a refined candidate geometric transform from first and second refined geometric transform candidates based on detection metrics; and
means for extracting a digital payload from the embedded signal using a selected refined candidate geometric transform.