1. A method of generating a composite image from a plurality of partially overlapping images, comprising the steps of: a) taking said partially overlapping images along a plurality of optical axes of an image-forming lens, said partially overlapping images including a first image portion and a second image portion, said first image portion and said second image portion sharing at least a common pattern; b) determining an angular relation between said first image portion and said second image portion based upon said common pattern; b') converting first angular information of said first image portion into second angular information according to an angular system of said second image portion so as to generate unified angular information; and c) generating the composite image from said first image portion and said second image portion based upon said unified angular information.