Methods and apparatus for determining the motion of a movable object are disclosed. The methods may include, in a view of the environment outside the movable object, identifying a first region of interest (ROI) corresponding to a static portion of the environment. The methods may also include, in the view of the environment, identifying a second region of interest (ROI) corresponding to an active portion of the environment. The methods may also include receiving first and second image data respectively representing the first and second ROIs. The methods may also include analyzing the first image data over time. The methods may also include analyzing the second image data over time. The methods may further include determining whether the movable object is in motion based on the analyzes of the first and second image data.