Rotationally symmetric tags

G - Physics – 06 – K

Patent

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Details

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

Patent

CA 2508126

Machine-readable coded data disposed on or in a substrate in accordance with a layout, and method of generating such coded data, The layout has six-fold rotational symmetry and includes 6 identical sub-layouts rotated 1/6 revolutions apart about a center of rotational symmetry of the layout. The coded data is disposed in accordance with each sub-layout including rotation- indicating data that distinguishes the rotation of that sub-layout from the rotation of at least one other sub-layout within the layout. In one embodiment, the symbols of the sub-layouts are interleaved with each other

L'invention concerne des données codées pouvant être lues par une machine disposées sur ou dans un substrat conformément à disposition, ainsi qu'un procédé permettant de générer de telles données codées. La disposition présente une symétrie rotationnelle à six plis et elle comprend 6 sous-dispositions identiques décalées de 1/6 de révolutions autour d'un centre de la symétrie rotationnelle de la disposition. Les données codées sont disposées conformément à chaque sous-disposition, y compris des données d'indication de rotation distinguant la rotation de cette sous-disposition de la rotation d'au moins une autre sous-disposition dans la disposition. Dans un mode de réalisation, les symboles des sous-dispositions sont entrelacés.

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