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Human Activity Recognition Using Sensors and Machine Learning: 2nd Edition

A special issue of Sensors (ISSN 1424-8220). This special issue belongs to the section "Wearables".

Deadline for manuscript submissions: 31 December 2024 | Viewed by 2940

Special Issue Editors


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Guest Editor
Department of Computer Science, Aalborg University, 9220 Aalborg, Denmark
Interests: deep learning; mobile computing; pervasive computing; Internet of Things; brain–computer interface; health informatics
Special Issues, Collections and Topics in MDPI journals

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Guest Editor
Department of Computer Science, Aalborg University, DK-9220, Aalborg, Denmark
Interests: data mining, deep learning and sensor-based human activity recognition
Special Issues, Collections and Topics in MDPI journals

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Guest Editor
Department of Manufacturing and Civil Engineering NTNU, Smart Innovation Norway, 1783 Halden, Norway
Interests: pattern recognition; application of artificial intelligence technology in water transportation systems
Special Issues, Collections and Topics in MDPI journals

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Guest Editor
School of Computer Science and Technology, MOEKLINNS Lab, Xi’an Jiaotong University, Xi’an, China
Interests: machine learning; deep learning; computer vision; weakly supervised learning; multi-modal emotion analysis; EEG emotion analysis

Special Issue Information

Dear Colleagues,

The recent advances in hardware and acquisition devices have accelerated the deployment of the Internet of Things, thus enabling myriad applications of human activity recognition. Human activity recognition is a time series classification task that involves predicting user behavior based on sensor data. The task is challenging in real-world applications due to many inherent issues and various practical problems in different scenarios. The most major inherent issue is how to filter noisy sensor data and extract high-quality features for better recognition performance. The practical problems include lightweight algorithms for wearable devices, modeling human behaviors with fewer annotated data, learning to recognize complex activities, continually learning patterns of streaming data, etc. Recently, we have witnessed compelling evidence from successful investigations of machine learning for activity recognition. While machine learning is shown to be effective and achieve state-of-the-art performance, the increasing number of related studies indicates that, in both academic and industrial communities, there is a considerable demand for developing more advanced machine learning algorithms in order to tackle the challenges and achieve a better activity recognition performance. Therefore, it is vital and timely to offer an opportunity of reporting the progress in human activity recognition using sensors and machine learning. The research foci of this Special Issue include theoretical studies, model designs, development, and advanced applications of machine learning algorithms on sensor-based activity data.

Dr. Dalin Zhang
Dr. Kaixuan Chen
Prof. Dr. Xu Cheng
Dr. Huan Liu
Guest Editors

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Keywords

  • supervised learning
  • semi-supervised learning
  • unsupervised learning
  • active learning
  • transfer learning
  • online learning
  • imbalance learning
  • representation learning
  • ensemble methods
  • auto-machine learning
  • data segmentation
  • explainable

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Related Special Issue

Published Papers (2 papers)

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Research

21 pages, 956 KiB  
Article
BodyFlow: An Open-Source Library for Multimodal Human Activity Recognition
by Rafael del-Hoyo-Alonso, Ana Caren Hernández-Ruiz, Carlos Marañes-Nueno, Irene López-Bosque, Rocío Aznar-Gimeno, Pilar Salvo-Ibañez, Pablo Pérez-Lázaro, David Abadía-Gallego and María de la Vega Rodrigálvarez-Chamarro
Sensors 2024, 24(20), 6729; https://doi.org/10.3390/s24206729 - 19 Oct 2024
Viewed by 881
Abstract
Human activity recognition is a critical task for various applications across healthcare, sports, security, gaming, and other fields. This paper presents BodyFlow, a comprehensive library that seamlessly integrates human pose estimation and multiple-person estimation and tracking, along with activity recognition modules. BodyFlow enables [...] Read more.
Human activity recognition is a critical task for various applications across healthcare, sports, security, gaming, and other fields. This paper presents BodyFlow, a comprehensive library that seamlessly integrates human pose estimation and multiple-person estimation and tracking, along with activity recognition modules. BodyFlow enables users to effortlessly identify common activities and 2D/3D body joints from input sources such as videos, image sets, or webcams. Additionally, the library can simultaneously process inertial sensor data, offering users the flexibility to choose their preferred input, thus facilitating multimodal human activity recognition. BodyFlow incorporates state-of-the-art algorithms for 2D and 3D pose estimation and three distinct models for human activity recognition. Full article
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26 pages, 5154 KiB  
Article
A Robust Deep Feature Extraction Method for Human Activity Recognition Using a Wavelet Based Spectral Visualisation Technique
by Nadeem Ahmed, Md Obaydullah Al Numan, Raihan Kabir, Md Rashedul Islam and Yutaka Watanobe
Sensors 2024, 24(13), 4343; https://doi.org/10.3390/s24134343 - 4 Jul 2024
Viewed by 1643
Abstract
Human Activity Recognition (HAR), alongside Ambient Assisted Living (AAL), are integral components of smart homes, sports, surveillance, and investigation activities. To recognize daily activities, researchers are focusing on lightweight, cost-effective, wearable sensor-based technologies as traditional vision-based technologies lack elderly privacy, a fundamental right [...] Read more.
Human Activity Recognition (HAR), alongside Ambient Assisted Living (AAL), are integral components of smart homes, sports, surveillance, and investigation activities. To recognize daily activities, researchers are focusing on lightweight, cost-effective, wearable sensor-based technologies as traditional vision-based technologies lack elderly privacy, a fundamental right of every human. However, it is challenging to extract potential features from 1D multi-sensor data. Thus, this research focuses on extracting distinguishable patterns and deep features from spectral images by time-frequency-domain analysis of 1D multi-sensor data. Wearable sensor data, particularly accelerator and gyroscope data, act as input signals of different daily activities, and provide potential information using time-frequency analysis. This potential time series information is mapped into spectral images through a process called use of ’scalograms’, derived from the continuous wavelet transform. The deep activity features are extracted from the activity image using deep learning models such as CNN, MobileNetV3, ResNet, and GoogleNet and subsequently classified using a conventional classifier. To validate the proposed model, SisFall and PAMAP2 benchmark datasets are used. Based on the experimental results, this proposed model shows the optimal performance for activity recognition obtaining an accuracy of 98.4% for SisFall and 98.1% for PAMAP2, using Morlet as the mother wavelet with ResNet-101 and a softmax classifier, and outperforms state-of-the-art algorithms. Full article
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