, C. Papageorgiou and T. Poggio , A Trainable Pedestrian Detection system , International Journal of Computer Vision ( IJCV ) , pages 1 : 15-33 , 2000 others uses local features like histogram of oriented gradients N. Dalal , B. Triggs , Histograms of oriented gradients for human detection , IEEE Computer Society Conference on Computer Vision and Pattern Recognition ( CVPR ) , pages 1 : 886-893 , 2005 descriptors .