Patent ID: 11972073
Assignee: ALPS ALPINE CO., LTD.
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 12:
13. An input determination method executed by a computer, the method comprising:
obtaining a reference value of capacitance at a plurality of coordinates of an electrostatic coordinate input unit and subtracting the reference value from the capacitance to convert the capacitance to difference values according to a distance between the electrostatic coordinate input unit at the plurality of coordinates and a finger;
calculating barycentric coordinates of a contact portion from the difference values for the plurality of coordinates;
determining whether the difference values at coordinates on a circumference of a circle with a predetermined radius centered on the barycentric coordinates exhibit periodicity of two cycles in one round along the circle; and
when it is determined that the difference values exhibit periodicity of two cycles, determining that an input operation using two or more fingers has been performed.