Patent ID: 11900497
Assignee: DIGIMARC CORPORATION
Field: Computer technology (Electrical engineering)
Classification: CPC G  B | IPC B  G

Claim 14:
15. An image processing method comprising:
obtaining first imagery representing a substrate, the substrate comprising a color ink printed thereon and a clear topcoat layer arranged according to a 2D encoded signal, the 2D encoded signal comprising positive signal components, in which the first imagery is associated with a first capture angle between a camera and the substrate;
analyzing the first imagery to decode the 2D encoded signal;
inverting the first imagery to yield inverted first imagery and attempting to decode the 2D encoded signal from the inverted first imagery;
obtaining second imagery representing the substrate, in which the second imagery is associated with a second capture angle between the camera and the substrate, the first capture angle and the second capture angle comprising different capture angles;
inverting the second imagery to yield inverted second imagery and attempting to decode the 2D encoded signal from the inverted second imagery;
in which the substrate, or an object associated with the substrate, is deemed authentic when the 2D encoded signal is detected from: i) the inverted first imagery or the inverted second imagery, and ii) the first imagery or the second imagery.