1. A method for operating an array camera having a plurality of camera modules, the method comprising: acquiring images through the plurality of camera modules; grouping the acquired images into a first group and a second group by comparing the acquired images; generating an interpolated image using the images of the first group to substitute for an image of the second group; and generating a composite image using images of the first group, wherein the generating of the composite image includes generating the composite image by combining the images of the first group with the interpolated image.