Analysis of masonry work activity recognition accuracy using a spatiotemporal graph convolutional network across different camera angles

Human activity recognition (HAR) in construction has gained attention for its potential to improve safety and productivity. While HAR research has shifted toward vision-based approaches, many studies typically use data from a specific angle, limiting understanding of how camera angles affect accurac...

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Bibliographic Details
Published in:Automation in construction Vol. 175; p. 106178
Main Authors: Yun, Sangyoon, Hong, Sungkook, Hwang, Sungjoo, Lee, Dongmin, Kim, Hyunsoo
Format: Journal Article
Language:English
Published: Elsevier B.V 01.07.2025
Subjects:
AlphaPose
Camera angle
Human Activity Recognition (HAR)
Spatial-Temporal Graph Convolutional Network (ST-GCN)
Human Activity Recognition (HAR)
AlphaPose
Camera angle
Spatial-Temporal Graph Convolutional Network (ST-GCN)
ISSN:0926-5805
Online Access:Get full text
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Summary:Human activity recognition (HAR) in construction has gained attention for its potential to improve safety and productivity. While HAR research has shifted toward vision-based approaches, many studies typically use data from a specific angle, limiting understanding of how camera angles affect accuracy. This paper addresses this gap by using AlphaPose and Spatial-Temporal Graph Convolutional Network (ST-GCN) algorithms to analyze the impact of various camera angles on HAR accuracy in masonry work. Data was collected from seven angles (0° to 180°), with the frontal view only used for training. Results showed consistently high recognition accuracy (>80 %) for side views, while accuracy decreased as the camera shifted toward rear views, especially from directly behind due to occlusion. By quantifying HAR accuracy across angles, this study provides baseline data for predicting performance from various camera positions, improving camera placement strategies and enhancing monitoring system effectiveness on construction sites. •Evaluates HAR accuracy in masonry work from various camera angles.•High recognition accuracy (>80 %) for side-view camera positions.•Accuracy drops in rear views due to occlusion of worker movements.•Provides guidance for camera placement in construction monitoring.
ISSN:0926-5805
DOI:10.1016/j.autcon.2025.106178