Optimization for host based touch processing

A method of processing a touch input signal, the method comprising:

• receiving a plurality of data points corresponding to a plurality of touch events on the touch device,
• determining a center of mass estimate from the plurality of data points;
• determining a search radius of center of mass estimate;
• for each of a plurality of maximum likelihood estimation models:
• determining a touch location estimate based on the center of mass estimate and the search radius using a maximum likelihood estimation model of the plurality of maximum likelihood estimation models;
• calculating an error of the touch location determined using the maximum likelihood estimation model;
• selecting a touch location estimate from the plurality of maximum likelihood estimation models based on the calculated errors;
• and
• determining an optimal touch point position based on a comparison of the error of the selected touch location estimate to a threshold.

A non-transitory, computer readable storage medium having instructions stored thereon that cause a processing circuit to perform a method comprising:

• receiving a plurality of data points corresponding to a plurality of touch events on the touch device,
• determining a center of mass estimate from the plurality of data points;
• determining a search radius of center of mass estimate;
• for each of a plurality of maximum likelihood estimation models:
• determining a touch location estimate based on the center of mass estimate and the search radius using a maximum likelihood estimation model of the plurality of maximum likelihood estimation models;
• calculating an error of the touch location determined using the maximum likelihood estimation model;
• selecting a touch location estimate from the plurality of maximum likelihood estimation models based on the calculated errors;
• and
• determining an optimal touch point position based on a comparison of the error of the selected touch location estimate to a threshold.

An apparatus for processing a touch input signal, comprising:

• means for receiving a plurality of data points corresponding to a plurality of touch events on the touch device,
• means for determining a center of mass estimate from the plurality of data points;
• means for determining a search radius of center of mass estimate;
• for each of a plurality of maximum likelihood estimation models:
• means for determining a touch location estimate based on the center of mass estimate and the search radius using a maximum likelihood estimation model of the plurality of maximum likelihood estimation models;
• means for calculating an error of the touch location determined using the maximum likelihood estimation model;
• means for selecting a touch location estimate from the plurality of maximum likelihood estimation models based on the calculated errors;
• and
• means for determining an optimal touch point position based on a comparison of the error of the selected touch location estimate to a threshold.