Context-Adaptive CCTV Pan-Tilt-Zoom method for Personal Protective Equipment Detection Seokhwan kim, Minwoo Jeong, Minkyu Koo, Taegeon Kim, Hongjo Kim Pages 768-775 (2024 Proceedings of the 41st ISARC, Lille, France, ISBN 978-0-6458322-1-1, ISSN 2413-5844) Abstract: PPE items, including hardhats, hooks, harnesses, and straps, are critical for fall prevention. Ongoing research in construction safety has focused on using deep learning models to detect Personal Protective Equipment (PPE) worn by high-altitude workers. Despite efforts using computer vision-based models for safety monitoring, small object detection, such as hooks and straps, remains challenging due to image resolution issues. This study introduces a novel technique using mobile CCTV cameras controlled by an automated Pan-Tilt-Zoom (PTZ) algorithm to enhance the detection of small-sized PPE. The method leverages the size gap between worker and PPE. In a zoomed-out state with a short focal length, the system identifies the worker's bounding box (b-box), then zooms in with a longer focal length for precise PPE detection. When encountering multiple workers, the system applies predetermined zoom-in rules. Experimental results demonstrated a significant increase in detection accuracy for the small PPE: hook detection improved from 39.8% to 88.3%, and strap detection from 49.4% to 71.8%, as measured by an mAP of 50. This encouraging performance improvement suggests that automated PTZ control technology could enhance the effectiveness of safety monitoring. Keywords: Construction safety, PTZ CCTV control, monitoring, PPE detection, Small object detection DOI: https://doi.org/10.22260/ISARC2024/0100 Download fulltext Download BibTex Download Endnote (RIS) TeX Import to Mendeley