Contrastive-based YOLOv7 for personal protective equipment detection

Hussein Samma*, Sadam Al-Azani, Hamzah Luqman, Motaz Alfarraj

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


You only look once (YOLO) is a state-of-the-art object detection model which has a novel architecture that balances model complexity with the inference time. Among YOLO versions, YOLOv7 has a lightweight backbone network called E-ELAN that allows it to learn more efficiently without affecting the gradient path. However, YOLOv7 models face classification difficulties when dealing with classes that have a similar shape and texture like personal protective equipment (PPE). In other words, the Glass versus NoGlass PPE objects almost appear similar when the image is captured at a distance. To mitigate this issue and further improve the classification performance of YOLOv7, a modified version called the contrastive-based model is introduced in this work. The basic concept is that a contrast loss branch function has been added, which assists the YOLOv7 model in differentiating and pushing instances from different classes in the embedding space. To validate the effectiveness of the implemented contrastive-based YOLO, it has been evaluated on two different datasets which are CHV and our own indoor collected dataset named JRCAI. The dataset contains 12 different types of PPE classes. Notably, we have annotated both datasets for the studied 12 PPE objects. The experimental results showed that the proposed model outperforms the standard YOLOv7 model by 2% in mAP@0.5 measure. Furthermore, the proposed model outperformed other YOLO variants as well as cutting-edge object detection models such as YOLOv8, Faster-RCNN, and DAB-DETR.

Original languageEnglish
Pages (from-to)2445-2457
Number of pages13
JournalNeural Computing and Applications
Issue number5
StatePublished - Feb 2024

Bibliographical note

Publisher Copyright:
© 2023, The Author(s), under exclusive licence to Springer-Verlag London Ltd., part of Springer Nature.


  • CHV dataset
  • Contrastive learning
  • Object detection
  • PPE
  • YOLO

ASJC Scopus subject areas

  • Software
  • Artificial Intelligence


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