| 摘要 |
A product has a surface provided with a first coding pattern and a second coding pattern. The coding patterns may include symbols each of which represents at least two different values. Each symbol in the first coding pattern may be defined by one raster point and at least one marking, the raster point being included in a first raster, which extends over the surface. Each symbol in the second coding pattern may also be defined by one raster point and at least one marking, the raster point being included in a second raster. This second raster may be displaced in relation to the first raster and may have a different spatial scale than the first raster. Each symbol in the first and the second pattern may have a value which, for example, can be indicated by the location of the marking belonging to the symbol in relation to a raster point in the first and second raster, respectively.
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