A method of estimating a position of a point on a writing implement relative to an optical sensor mounted on the writing implement is provided. The method comprises the steps of: (a) placing the point in contact with a coded surface; (b) capturing, using the sensor, at least two images of the coded surface...http://www.google.fr/patents/US7649523?utm_source=gb-gplus-shareBrevet US7649523 - Method of estimating position of writing nib relative to an optical sensor
Method of estimating position of writing nib relative to an optical sensor
