1. A method for identifying layout of a plurality of surface regions on an object, the method comprising the steps of: (a) acquiring a plurality of images of the object under a plurality of mutually different illumination conditions; (b) obtaining layouts of a plurality of image areas different from the layout of the plurality of surface regions on the object by performing segmentation on the plurality of images respectively; and (c) identifying the layout of the plurality of surface regions based on the layouts of the plurality of image areas.