1. A method for detecting the movement of an image sensor according to a first, second, third, and fourth frame, all captured by the image sensor, comprising the following steps: capturing a first captured image region from the first frame; capturing a first corresponding region matching the first captured image region from the second frame, wherein the first corresponding region shifts in a predetermined direction relative to the first captured image region; capturing a second captured image region from the third frame, wherein the second captured image region shifts in a direction opposite to the predetermined direction relative to the first captured image region; capturing a second corresponding region matching the second captured image region from the fourth frame; and determining the movement of the image sensor according to the second captured image region and the second corresponding region.