System and method for calibrating a touch sensor

Abstract

A method for calibrating a touch sensor includes: at a calibration system during a calibration routine, applying a probe, at a target selection force, to a sequence of locations on a touch sensor surface of a touch sensor; at the touch sensor, capturing a sequence of touch images representing magnitudes of forces detected on the touch sensor surface during the calibration routine; fusing the sequence of touch images into a response map representing magnitudes of forces detected on the touch sensor surface by the touch sensor responsive to application of the target selection force on the touch sensor surface by the probe during the calibration routine; generating a force compensation map defining threshold forces for detecting selections at the target selection force on the touch sensor surface based on the response map.

I claim: 
     
           1   .. A method comprising:
 during a first time period: 
 at a touch sensor, capturing a first touch image during application of a target selection force, by a probe, to a first location on a touch sensor surface of the touch sensor; 
 interpreting a first force magnitude, at the first location on the touch sensor surface, based on the first touch image; and 
 generating a force compensation map, defining a threshold force for detecting a selection, at the target selection force, at the first location on the touch sensor surface based on the first force magnitude; and 
   during a second time period succeeding the first time period: 
 reading a set of force values from the touch sensor; 
 interpreting a second force magnitude, at the first location on the touch sensor surface, based on the set of force values; and 
 in response to the second force magnitude exceeding the threshold force assigned to the first location by the force compensation map, registering a first selection at the first location on the touch sensor surface.