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Measuring Elemental Time and Duty Cycle Using Automated Video Processing
  • Published Date:
    Mar 02 2016
  • Source:
    Ergonomics. 59(11):1514-1525.

Public Access Version Available on: November 01, 2017 information icon
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  • Pubmed ID:
  • Pubmed Central ID:
  • Description:
    A marker-less 2D video algorithm measured hand kinematics (location, velocity and acceleration) in a paced repetitive laboratory task for varying hand activity levels (HAL). The decision tree (DT) algorithm identified the trajectory of the hand using spatiotemporal relationships during the exertion and rest states. The feature vector training (FVT) method utilised the k-nearest neighbourhood classifier, trained using a set of samples or the first cycle. The average duty cycle (DC) error using the DT algorithm was 2.7%. The FVT algorithm had an average 3.3% error when trained using the first cycle sample of each repetitive task, and had a 2.8% average error when trained using several representative repetitive cycles. Error for HAL was 0.1 for both algorithms, which was considered negligible. Elemental time, stratified by task and subject, were not statistically different from ground truth (p < 0.05). Both algorithms performed well for automatically measuring elapsed time, DC and HAL. Practitioner Summary: A completely automated approach for measuring elapsed time and DC was developed using marker-less video tracking and the tracked kinematic record. Such an approach is automatic, repeatable, objective and unobtrusive, and is suitable for evaluating repetitive exertions, muscle fatigue and manual tasks.

  • Document Type:
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  • Funding:
    R21 EB014583/EB/NIBIB NIH HHS/United States
    R21 OH010221/OH/NIOSH CDC HHS/United States
    T42 OH008455/OH/NIOSH CDC HHS/United States
  • Supporting Files:
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