Importance

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Abstract

A sensing device for sensing coded data on a surface is provided having marking and non-marking nibs for contact with the surface, a selection mechanism for moving the nibs relative to each other to select which nib contacts the surface, an image sensor for sensing the coded data, memory for storing respective identities of the nibs, and a processor for identifying the selected nib from the stored nib identities and processing the sensed coded data. The coded data is encoded in coded tags printed across the surface and indicates the position of that tag on the surface and an identity of the surface which is associated with a digital description of the surface maintained by a processing device. The processor determines an orientation and a position of the sensing device relative to the surface from the sensed coded data and the digital description.

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First Claim