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Abstract

A method of generating an interface surface is provided, in which machine-readable coded data is generated in a computer system in accordance with a layout and is printed onto a surface with a printer in communication with the computer system. The layout has at least order n rotational symmetry, where n is at least two, and encodes a fault tolerant orientation codeword comprising a sequence of an integer multiple m of n symbols, where m is one or more. Each encoded symbol is distributed at n locations about a center of rotational symmetry of the layout such that decoding the symbols at each of the n orientations of the layout produces n representations of the orientation codeword. Each representation has a different cyclic shift of the orientation codeword and is indicative of the degree of rotation of the layout.

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First Claim