Oblique random forest based on partial least squares applied to pedestrian detection
Artur Jordão Lima Correia, William Robson Schwartz · 2016
The increasing popularity of approaches based on random forest in computer vision tasks is due to its simplicity and flexibility with complex data. Random forest is a set of decision trees that can be divided in two subsets according to the view of the feature descriptors provided as input: orthogonal and oblique. In the former, the feature space is separated orthogonally (axis-aligned) by a single feature at a time. In the latter, it separates the space by oriented hyperplanes, which usually provides better data modeling. This work proposes a novel oblique random forest associated with Partial Least Squares to perform the oblique split. We validate the proposed approach, referred to as oRF-PLS, on the challenge INRIA Person dataset. Experimental results demonstrate that the proposed method outperforms traditional state-of-the-art detectors. In addition, we demonstrate that PLS is a more suitable choice to build oblique random forest than SVM, being faster and producing more accurate forests.