Abstract
In the context of Industry 4.0, a wide range of sensors are extensively deployed to gather production and equipment operation data, while also connecting human workforce information through the industrial Internet of Things technology. This integration enables effective improvements in sustainable, human-centric, and resilient productivity by leveraging industrial process control and automation. In this paper, we propose an intelligent information system for analyzing large point cloud data sets from depth sensors, which are used for detecting, representing, locating, and sha** monitored objects. To address privacy concerns, our system only considers de-identified information during analysis, using a newly proposed dynamic clustering method based on multivariate mixture Student’s t-distribution for monitoring human motions. The information system consists of two main blocks: segmentation and dynamic clustering for monitoring or tracking. The segmentation algorithm, utilizing a multivariate mixture Student’s t-distribution, groups points into homogeneous partitions based on spatial proximity and surface normal similarity, without relying on any semantic indicator or pre-determined shape. The dynamic clustering algorithm, powered by an online learning state-space model, efficiently incorporates and updates the centroid position and velocity of the object being monitored. To evaluate the reliability of our proposed method, we introduce two time-consistent measures that account for different illumination levels, drastic limb movements, and partial or full occlusions during object motion processing. We conduct empirical experiments using a large point cloud data set, comparing our method with several alternative methods. The results highlight the superiority of our proposed method.
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Notes
Here, the term “frame" denotes a single image of video or temporal data. In this study, we treat a frame and the corresponding point cloud as interchangeable entities, representing the same information.
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Acknowledgements
We would like to extend our sincere gratitude to Professor W. Brent Lindquist for organizing the Mathematics & Statistics seminars at Texas Tech University, USA. We are immensely grateful to all the participants for their valuable time, thoughtful reviews, and constructive feedback on our paper. Their insightful comments have significantly enriched our research. Additionally, we would like to express our heartfelt appreciation to the two guest editors for their invaluable feedback and insightful comments, which have greatly contributed to improving the quality of our work.
Funding
This work was supported in part by the Center for Open Intelligent Connectivity from The Featured Areas Research Center Program within the framework of the Higher Education Sprout Project by the Ministry of Education, National Science and Technology Council (NSTC 110-2622-8-A49-022, 112-2221-E-A49-049), and NCKU Miin Wu School of Computing in Taiwan and supported by InfoTech from 2018 to 2021 under USt-IdNr. DE320245686 in Germany.
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Chen, C.Y.T., Sun, E.W. & Lin, YB. Reliable information system for identifying spatio-temporal continuity of kinetic deformed objects with big point cloud data. Ann Oper Res (2023). https://doi.org/10.1007/s10479-023-05522-z
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DOI: https://doi.org/10.1007/s10479-023-05522-z