Patent ID: 11875218
Assignee: DIGIMARC CORPORATION
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 8:
9. A method employing image data corresponding to a physical object, said physical object having earlier been marked to convey a 2D machine-readable indicia of a first size, said earlier-marked indicia including a payload signal component and a reference signal component, the method comprising the acts:
determining spatial correspondence between the image data and the reference signal component of the 2D machine-readable indicia;
selecting a first patch of the image data that is smaller than the first size, and correlating said first patch of the image data with a spatially-corresponding patch of the reference signal component;
selecting a second patch of the image data that is smaller than the first size, and correlating said second patch of the image data with a spatially-corresponding patch of the reference signal component;
concluding, from results of said correlating acts, that one of said patches of the image data exhibits inversion and one of said patches of the image data does not exhibit inversion; and
adjusting a subset of the image data to compensate for the one of said patches of the image data that exhibits inversion.