System and method for calibrating a touch sensor

A method comprising:

• during first time period:
• at a touch sensor, capturing a first touch image during application by a probe of a reference force, 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 first correction function for calibrating forces detected at the first location on the touch sensor surface based on the first force magnitude;
• during a second time period, succeeding the first time period:
• reading a set of electrical values from the touch sensor;
• interpreting a first uncorrected force magnitude at the first location on the touch sensor surface based on the set of electrical values;
• and
• calculating a corrected force magnitude at the first location on the touch sensor surface based on the first uncorrected force magnitude and a first correction function for the first location.

A system comprising:

• during first time period:
• at a touch sensor, reading a first set of electrical values during application by a probe of a reference forcer, 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 set of electrical values;
• and
• generating 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 second set of electrical values from the touch sensor;
• interpreting a second force magnitude, at the first location on the touch sensor surface, based on the second set of electrical values;
• and
• in response to the second force magnitude exceeding the threshold force for the first location, registering a first selection at the first location on the touch sensor surface.