1. A method for identifying main objects in digital images, the method implemented at least in part by a data processing system and comprising: receiving a digital image representing a scene; identifying range information associated with the digital image and including distances of pixels in the scene from a known reference location; identifying at least one main object in the digital image based at least upon an analysis of the range information and the digital image; and storing an indication of the identified at least one main object in a processor-accessible memory system.