public Features(int numbFaces, int numbNonFaces){
		if((numbFaces == numbNonFaces) && (numbFaces == 0)){
			numbFaces = new File(FACES).listFiles().length;
			numbNonFaces = new File(NONFACES).listFiles().length;
		} else {
			this.numbFaces = numbFaces;
			this.numbNonFaces = numbFaces;
		}
		integralFaces = new int[numbFaces][SIZE][SIZE];
		integralNonFaces = new int[numbNonFaces][SIZE][SIZE];
		kvp = new ArrayList<SimpleEntry<Integer, List<Feat>>>();
		result = new ArrayList<Feat>();
	}