Method and apparatus for recognizing motion of object, and associated system

The invention discloses a method and an apparatus for recognizing motion of an object, and an associated system. The method for recognizing motion of the object may include periodically obtaining depth data of a first resolution and two-dimensional data of a second resolution with respect to a scene by using an image capturing device, wherein the second resolution is higher than the first resolution; determining a motion tracking region by recognizing a target object in the scene based on the depth data, such that the motion tracking region corresponds to a portion of a frame and the portion includes the target object; periodically obtaining tracking region data of the second resolution corresponding to the motion tracking region; and/or analyzing the motion of the target object based on the tracking region data.