1. An image processing method, comprising: segmenting each image in a series of obtained images into segments; calculating a central point of each segment, wherein the central point of each segment corresponds to a center of a figure of the segment; calculating a distance between at least two central points of two neighboring segments; and setting at least one segment selected from among segments appearing in a plurality of the images as a target object based on movement variances determined for the central points of the segments throughout the series of images.