The paper does a good job of describing the features used for classification and how they are computed, but the choice of classifier seemed to be rather arbitrary. Some discussion on why this particular classifier was chosen and/or evaluation of different classifiers would probably have been a good idea. Also, the dataset used for training/testing was not described in any detail (and as far as I can tell it is not available on the web) so that it is hard to evaluate how good the classifier really is.