Reliable information system for identifying spatio-temporal continuity of kinetic deformed objects with big point cloud data

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 shaping 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.