Patent ID: 8633904

Claim:
A method of operating a touch-sensing surface, the method comprising: determining a first plurality of contact locations based on data from a first scan of the touch-sensing surface, wherein the first plurality of contact locations includes a first contact location; determining a second plurality of contact locations based on data from a second scan of the touch-sensing surface, wherein the second plurality of contact locations includes a second contact location, and wherein the second scan is subsequent to the first scan; identifying one or more contact locations that have not moved between the first scan and the second scan; determining a number of contact locations based on the number of the one or more contact locations that have not moved and on the number of the first plurality of contact locations or the number of the second plurality of contact locations; performing a first correlation process for correlating the second contact location with the first contact location if the number of contact locations is less than or equal to a first threshold number; and performing a second correlation process for correlating the second contact location with the first contact location if the number of contact locations is greater than a second threshold number.