| 摘要 |
An optically detectable encoding layout for a surface comprises a plurality of location markings 8 spaced across the surface according to a notional location lattice 10, with the markings encoding for local position on the surface, and one or more page identification markings 14 within the interstitial areas formed by the location lattice. Both types of markings may carry data either by virtue of their position, or by virtue of some other detectable characteristic such as shape. The invention may be used in digital paper applications. |
