Patent ID: 8837783

Claim:
A motion-controlled electronic device comprising: a memory operable to store a sequence of video frames captured by an image capture device connected to the electronic device; and a processor electrically connected to the memory, and operable to execute an operating method for the electronic device, wherein the method comprises: selecting two distinct frames from the sequence of video frames; executing phase correlation on the two distinct frames; storing normalized phase correlation values of the two distinct frames as a result of the phase correlation in a phase correlation image in the memory, wherein the phase correlation image records the normalized phase correlation values in a two-dimensional coordination space and is representative of a three-dimensional phase correlation surface in a three-dimensional coordination space spanned by axes of the two-dimensional coordination space and an axis representing scales of the normalized phase correlation values; locating a peak of the three-dimensional phase correlation surface; obtaining a motion of an object in the two distinct frames based on a location of the peak, wherein the peak reflects the motion; identifying the motion as a qualified motion based on a magnitude of the motion and a cross-sectional area of the peak; and activating a function of the electronic device in response to the qualified motion.