| 摘要 |
A product is on a surface provided with a first position code which codes coordinates for a plurality of first points. In at least one partial area on the surface, the product is further provided with a second position code which codes coordinates for a plurality of second points. The partial area further comprises a filed which is associated with a predetermined function to be performed in consequence of a user unit being placed in the field. Methods and devices for coding and for recording of information from a surface are also described. |
