Orientation-indicating cyclic position codes

G - Physics – 06 – K

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G06K 9/18 (2006.01) G06K 7/14 (2006.01) G06K 19/06 (2006.01)

Patent

CA 2502483

Machine-readable coded data disposed on or in a substrate in accordance with a layout, the layout having at least order n rotational symmetry, where n is at least two, the layout encoding an orientation codeword comprising a sequence of an integer multiple m of of n symbols, where m is one or more, each encoded symbol being 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 comprising a different cyclic shift of the orientation codeword and being indicative of the degree of rotation of the layout, and wherein the orientation codeword is fault tolerant.

Selon l'invention, des données codées lisibles par une machine sont disposées sur ou dans un substrat en fonction d'une disposition qui présente au moins une symétrie de rotation d'ordre n, n étant au moins égal à deux. Ladite disposition code un mot de code d'orientation qui comprend une séquence d'un nombre entier multiple m de n symboles, m étant supérieur ou égal à un, chaque symbole codé étant réparti au niveau de n emplacements autour d'un centre de symétrie de rotation de ladite disposition de façon que le décodage des symboles au niveau de chaque n orientation de la disposition produise n représentations du mot de code d'orientation, chaque représentation comprenant un décalage cyclique différent du mot de code d'orientation et indiquant le degré de rotation de la disposition, et le mode de code d'orientation étant insensible aux défaillances.

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