Digital paper

This article is about patterned paper used with a digital pen. For the display technology, see electronic paper. For the Sony e-reader, see Sony Digital Paper.
Simplified principle of the Anoto digital pen.
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.

Digital paper, also known as interactive paper, is patterned paper used in conjunction with a digital pen to create handwritten digital documents.[1] The printed dot pattern identifies the position coordinates on the paper. The digital pen uses this pattern to store handwriting and upload it to a computer.

  1. ^ The Livescribe Platform (commercial whitepaper)