code: public double[][] extractFeatures(BufferedImage image) throws Exception {
  		long start = System.currentTimeMillis();
  		double[][] features = extractFeaturesInternal(image);
  		totalNumberInterestPoints += features.length;
  		totalExtractionTime += System.currentTimeMillis() - start;
  		return features;
  	}
docs: Any normalizations of the features should be performed in the specific classes!
  
  @param image
  @return
  @throws Exception