Image descr iptor based on Histogram of Orientated Gradients for gray-level images. This code %was developed for the work: O. Ludwig, D. Delgado, V. Goncalves, and U. Nunes, 'Trainable %Classifier-Fusion Schemes: An Application To Pedestrian Detection,' In: 12th International IEEE %Conference On Intelligent Transportation Systems, 2009, St. Louis, 2009. V. 1. P. 432-437. In %case of publication with this code, please cite the paper above.