18. The method according to claim 17 , further comprising categorizing an input image with the image classifier.
18. The method according to claim 17 , further comprising categorizing an input image with the image classifier. 19. The method according to claim 18 , wherein said categorizing further comprises: identifying a plurality of key-patches in the input image; computing a feature vector for each of the plurality of key-patches; computing a histogram for each of the plurality of classes using the plurality of feature vectors computed; assigning at least one of the plurality of classes to the input image using the plurality of histograms computed as input to the classifier.