G PHYSICS
G06 COMPUTING; CALCULATING OR COUNTING
G06F ELECTRIC DIGITAL DATA PROCESSING
G06F3/00 Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
G06F3/01 Input arrangements or combined input and output arrangements for interaction between user and computer
G06F3/03 Arrangements for converting the position or the displacement of a member into a coded form
G06F3/041 Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
G06F3/0416 Control or interface arrangements specially adapted for digitisers
G06F3/0418 for error correction or compensation, e.g. based on parallax, calibration or alignment