1. An image processing method for classifying each region in an image, comprising: a confidence generation step for generating a classification confidence for each region in the image, the classification confidence represents the probability of a region belonging to a predefined class; and a classification step for classifying the regions in the image, which are obvious to be classified by their classification confidences, to respective classes based on the calculated confidences, the method further comprising: a fuzzy region extraction step for extracting one or more regions, which are not obvious to be classified by their classification confidences, as fuzzy regions; and a confidence update step for updating the classification confidence for each fuzzy region based on the classification confidences of adjacent regions thereof, wherein the classification step further classifies the fuzzy regions to respective classes based on the updated classification confidences.