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Journal of Control Science and Engineering
Volume 2018, Article ID 2605735, 10 pages
https://doi.org/10.1155/2018/2605735
Research Article

A Study of Chained Stochastic Tracking in RGB and Depth Sensing

Networked Robotics and Sensing Laboratory, School of Engineering Science, Simon Fraser University, 8888 University Drive, Burnaby, BC, Canada V5A 1S6

Correspondence should be addressed to Xuhong Liu; ac.ufs@lgnohux

Received 21 July 2017; Accepted 19 September 2017; Published 30 January 2018

Academic Editor: Enrique Onieva

Copyright © 2018 Xuhong Liu and Shahram Payandeh. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This paper studies the notion of hierarchical (chained) structure of stochastic tracking of marked feature points while a person is moving in the field of view of a RGB and depth sensor. The objective is to explore how the information between the two sensing modalities (namely, RGB sensing and depth sensing) can be cascaded in order to distribute and share the implicit knowledge associated with the tracking environment. In the first layer, the prior estimate of the state of the object is distributed based on the novel expected motion constraints approach associated with the movements. For the second layer, the segmented output resulting from the RGB image is used for tracking marked feature points of interest in the depth image of the person. Here we proposed two approaches for associating a measure (weight) for the distribution of the estimates (particles) of the tracking feature points using depth data. The first measure is based on the notion of spin-image and the second is based on the geodesic distance. The paper presents the overall implementation of the proposed method combined with some case study results.