Patent ID: 7982717

Claim:
A method for gesture detection on a touchpad, comprising the steps of: verifying that an object touches on the touchpad; determining whether or not the object moves on the touchpad; verifying that the object leaves the touchpad if the object is determined not to move on the touchpad in the previous step; initiating a first gesture signal after the object is verified to leave the touchpad; counting a departure time after the object leaves the touchpad; and producing a second gesture signal after the departure time reaches a reference time interval; wherein the step of verifying that an object touches on the touchpad comprises the steps of: monitoring a sensed value on the touchpad; monitoring a variation of the sensed value when the sensed value is greater than a threshold; and determining that the object touches on the touchpad if the sensed value remains greater than the threshold within a second reference time interval and maintains a continuously increasing trend during the second reference time interval.