1. A method for extracting a moving object representation from a series of images comprising: causing one or more processors to perform the steps of: aligning each of the images in the series to a common coordinate system; obtaining a background image from the aligned images; extracting the moving object representation from a particular image of the aligned images based on the background image; and detecting tiepoints among the images in the series, wherein the images in the series are aligned so that the detected tiepoints coincide in the common coordinate system.