Abstract: A tapping detection method of an optical navigation module is disclosed. The module includes an optical sensor and a processor. The method includes steps of calculating a displacement quantity of an object contacting with the optical navigation module according to a sense image sensed by the optical sensor, and comparing the displacement quantity with a displacement threshold value. When the displacement quantity is smaller than the displacement threshold value, the method further includes steps of calculating a brightness difference value of the sense image, and comparing the brightness difference value with a brightness threshold value. When the brightness difference value is smaller than the brightness threshold value, the optical navigation module may be determined to be tapped by the object.

Abstract: A detection method of an optical navigation device is disclosed. The device is used for determining whether an object is lifted from the optical navigation device or not. The method includes steps of reading the detection image detected by the optical navigation device, calculating the image signal value thereof during non-lift status, and integrating a historical threshold value with the image signal value according to adaptive factors for generating an adjustment threshold value serving as the navigation threshold of the detection image. The historical threshold value is the navigation threshold of a former detection image of the detection image. A step of comparing the adjustment threshold with the image signal value for determining whether the image signal value passes the navigation threshold or not may also be included. If the image signal value does not pass the navigation threshold, the object is determined as in the lift status.