Patent ID: 6098882
Filing Date: 2000-08-08
Classification: G06K

Abstract:
A method of encoding data on a substrate as digital data comprising:formatting the data into a series of digital data values wherein said series of digital data values are formatted into a pattern comprising a plurality of spaces at least some of which have dimensions M pixels by N pixels wherein at least one bit in said series of digital data values are represented in each of said plurality of spaces where at least one logical state is expressed by the presence in the space of a spot of a spot size with dimensions X pixels by Y pixels and at least one other logical state is expressed by the absence of a spot with dimensions X pixels by Y pixels from the space and where at least one of dimensions M, N, X, and Y is capable of differing from at least one other of the dimensions M, N, X, and Y; andoutputting said pattern onto at least one substrate, such that the data is represented in digitized form on said at least one substrate.