An image segment method is provided in this disclosure. The method is suitable for an electronic apparatus including a first camera and a motion sensor. The method includes steps of: providing at least one pre-defined model mask; fetching pose data from the motion sensor, the pose data being related to an orientation or a position of the first camera; adjusting one of the at least one pre-defined model mask into an adaptive model mask according to the pose data; and, extracting an object from an image captured by the first camera according to the adaptive model mask.