Importance

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Abstract

A process for decoding machine readable coded data is provided. The coded data has a plurality of layouts which each have order n (at least two) rotational symmetry and encode a codeword of a sequence of n symbols distributed at n locations about a center of rotational symmetry of the respective layout such that decoding the symbols at each of the n orientations of the layout produces n representations of the codeword. Each representation is a different cyclic shift of the codeword and is indicative of the degree of rotation of the layout. The process includes acquiring an image which includes the coded data with an image sensor, transmitting the acquired image to a computer system, and at the computer system, identifying a layout from the acquired image, decoding the identified layout to determine a codeword representation, and determining a degree of rotation of the layout from the determined representation.

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First Claim