摘要 |
An article (10), for example, a container, having an outer surface (24), at least a portion of which is curved, and a data matrix (26) disposed on the curved portion of the outer surface that is optically-readable to provide information associated with the article. The data matrix comprises a plurality of optically-readable elements (28), one or more of which has a different dimension in a direction of curvature of the outer surface than one or more other of the elements so that the plurality of elements appear to have an expected size and shape when optically viewed in a plane perpendicular to a radial line extending from the surface. |