Template:Anoto paper principle.svg
Appearance
![](http://upload.wikimedia.org/wikipedia/commons/thumb/1/1c/Anoto_paper_principle.svg/220px-Anoto_paper_principle.svg.png)
The camera identifies a 6×6 matrix of dots, each displaced from the blue grid (not printed) in one of 4 directions.
The combinations of relative displacements of a 6-bit de Bruijn sequence between the columns, and between the rows gives its absolute position on the digital paper.