Optical encoding

Details Optical encoding Optical encoding

2006-07-11

2006-07-11

Stein, Stephen (Department: 1775)

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

C428S916000, C235S494000, C283S073000, C283S074000, C283S088000, C283S089000

Reexamination Certificate

active

07074478

ABSTRACT:
A substrate, such as a document of value, carries a design feature (F), which includes an array of repeating patterns with the patterns exhibiting discrete differences in one or more visual characteristics, for example, shape, color or optical responses, according to a predetermined pattern. The differences are, preferably, indiscernible to the unaided eye, but can be discriminated by an optical reading machine. In an alternatively preferred embodiment, the visual characteristics of each pattern represent 8- or 16-bit information.

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