Redundant two-dimensional code and a decoding method
AssigneeBaumer Optronic GmbH
InventorsSergej Valentinovitch Boitsov, Vjatcheslav Aleksejevitch Kolesnik, Joachim Ihlefeld
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Abstract
In order to reduce a two-dimensional data structure to a minimum number of bits, a two-dimensional surface pattern is provided, which can be used in particular for identifying an absolute position on the surface and which has a pattern which comprises a SYNC pattern, which is used for synchronization, and a position-dependent code PC(x, y), with the SYNC pattern being variable and being formed in accordance with an already known formation rule.
Claims28
A two-dimensional surface pattern, in particular for identifying an absolute position on the surface, comprising
- a pattern (1),
- the pattern (1) containing a SYNC pattern (2), which is used for synchronization, and a position-dependent code PC (x, y),
- wherein
- the SYNC pattern (2) is variable and is formed in accordance with an already known formation rule, wherein the pattern has a modulation, and wherein said modulation comprises amplitude modulation.
A method for decoding data in an area of a surface pattern, with the surface pattern containing a variable SYNC pattern (2), which is used for synchronization and is formed in accordance with an already known formation rule, as well as a position-dependent code PC(x, y), with the SYNC pattern (2) comprising the least significant bit of the position-dependent code PC (x, y), and whereby a code unit consists of a 6×6 bits, wherein a complete position-dependent code which is associated with one position on the surface pattern can always be decoded from the area (6) of the surface pattern (1), in that parts of adjacent position-dependent codes which are located in that area of the surface pattern are used to supplement missing parts of the position-dependent code for decoding.
Dependencies are inferred from the claim text.