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Abstract

A method of interacting with a printed form. The method includes the steps of: maintaining a page description corresponding to a printed form; receiving, indicating data from an optically imaging pen operated by the user, the indicating data being indicative of the identity of the form and of a position of a nib of the pen relative to the form; retrieving the page description using the identity of the form; and identifying an interaction with the form using the position of the nib and the retrieved page description. The position of the nib is determined by inferring a perspective transform from perspective-distorted corners of a tag of known size when sensing the coded data and using the perspective transform together with a known geometry of pen optics to compute the position of the nib.

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First Claim