Assessing Workers’ Operational Postures via Egocentric Camera Mapping
Bibliographic record
Abstract
Construction tasks involve extensive and repetitive physically demanding activities, which results in a higher risk of work-related musculoskeletal disorders (WMSDs) compared to other industries. Thus, assessing construction workers’ postural ergonomics during construction occupational tasks is critical to evaluating workers’ postural stresses and reducing the potential risk of WMSDs. Recent developments in machine learning-based computer vision methods have attracted an increasing attention of construction researchers as it is an effective tool for assessing postural ergonomics. However, existing computer vision-based ergonomic assessments in the construction research field are still mainly based on multiple-view motion tracking systems or fixed-position stand-alone cameras. These types of motion-tracking methods are limited by resource-expensive and serious occlusion issues. As an alternative approach, this paper proposes an economical and scalable machine learning enabled egocentric postural ergonomic assessment (EPEA) system that integrates the fisheye camera mounted to the hard hat to identify and assess workers’ postural ergonomics via a convolutional 3D pose estimation neural network. We tested the EPEA with multiple construction operational tasks. Results show that the EPEA can correctly identify users’ key joint parts and classify different postures. The results confirmed the usability and feasibility of the proposed system, and it has the potential to help construction workers to identify the potential WMSDs risks during repetitive and forceful construction works.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 0.001 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".