OPTICALLY IMAGING STYLUS FOR INTERACTING WITH SUBSTRATE HAVING IMAGEABLE POSITION-CODING PATTERN

摘要

An optically imaging stylus for interacting with a substrate having an imageable position-coding pattern identifying a plurality of locations on the substrate. The stylus includes: a nib; an image sensor; and a processor configured for: (i) inferring a perspective transform using perspective-distorted features of the imaged position-coding pattern; (ii) determining a rotational orientation of the stylus relative to the position-coding pattern; (iii) acquiring and decoding coded data contained in the imaged position-coding pattern, the decoded coded data identifying an imaged location on the substrate; (iv) calculating a nib position using: the imaged location, the perspective transform and the determined rotational orientation, the nib position being different than the imaged location; and (v) generating digital ink identifying the nib position.