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Title: High-order local spatial context modeling by spatialized random forest
Authors: Ni, B.
Yan, S. 
Wang, M.
Kassim, A.A. 
Tian, Q.
Keywords: Object classification
random forest
spatial context
visual codebook
Issue Date: 2013
Source: Ni, B., Yan, S., Wang, M., Kassim, A.A., Tian, Q. (2013). High-order local spatial context modeling by spatialized random forest. IEEE Transactions on Image Processing 22 (2) : 739-751. ScholarBank@NUS Repository.
Abstract: In this paper, we propose a novel method for spatial context modeling toward boosting visual discriminating power. We are particularly interested in how to model high-order local spatial contexts instead of the intensively studied second-order spatial contexts, i.e., co-occurrence relations. Motivated by the recent success of random forest in learning discriminative visual codebook, we present a spatialized random forest (SRF) approach, which can encode an unlimited length of high-order local spatial contexts. By spatially random neighbor selection and random histogram-bin partition during the tree construction, the SRF can explore much more complicated and informative local spatial patterns in a randomized manner. Owing to the discriminative capability test for the random partition in each tree node's split process, a set of informative high-order local spatial patterns are derived, and new images are then encoded by counting the occurrences of such discriminative local spatial patterns. Extensive comparison experiments on face recognition and object/scene classification clearly demonstrate the superiority of the proposed spatial context modeling method over other state-of-the-art approaches for this purpose. © 1992-2012 IEEE.
Source Title: IEEE Transactions on Image Processing
ISSN: 10577149
DOI: 10.1109/TIP.2012.2222895
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