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Abstract

A method of interacting with a printed substrate. The method includes the steps of: interacting with the printed substrate using an optically imaging pen having a nib; imaging a tag on the substrate to provide image data; identifying target elements in the image data and inferring a perspective transform using perspective distortion of the target elements due to a tilt of the pen; acquiring and decoding coded data contained in the imaged tag; calculating a nib position using a tag location, the perspective transform and a known geometry of pen optics; and communicating digital ink to a computer system. The digital ink identifies the nib position and the substrate identity such that the computer system can interpret the digital ink and perform an action in response to the interaction with the printed substrate.

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First Claim