Patent ID: 11952173
Assignee: DIGIMARC CORPORATION
Field: Audio-visual technology (Electrical engineering)
Classification: CPC B  G  H | IPC B  G  H

Claim 0:
1. A container comprising:
an aluminum alloy shell, the aluminum alloy shell comprising an outer surface and an inner surface;
a first layer of transparent ink printed over the outer surface within a first region, in which the first layer of the transparent ink is printed to include a plurality of holes without any transparent ink printed therein;
a second layer of the transparent ink printed over the first layer of the transparent ink within the first region, in which the second layer of the transparent ink is printed to include a plurality of holes without any the transparent ink printed therein, in which the plurality of holes in the first layer and the plurality of holes in the second layer occupy overlapping spatial coordinates within the first region;
an opaque ink printed within the plurality of holes in the first layer and the plurality of holes in the second layer within the first region,
in which: i) the outer surface/first layer/second layer, and ii) the outer surface/opaque ink comprise a spectral reflectance difference in a range of 8%-35%, and
in which the plurality of holes in the first layer and the plurality of holes in the second layer are arranged in a 2-dimensional pattern according to a machine-readable signal, the 2-dimensional pattern being machine-readable from imagery captured of the first region.