The effect of viewing angle on wrist posture estimation from photographic images using novice raters

Details

• Personal Author:
  Armstrong TJ ; Lau MH
• Description:
  Observational assessment of wrist posture using photographic methods is theoretically affected by camera view angle. A study was conducted to investigate whether wrist flexion/extension and radial/ulnar deviation postures were estimated differently by raters depending on the viewing angle and compared to predictions using a quantitative 2D model of parallax. Novice raters (n=26) estimated joint angles from images of wrist postures photographed from ten different viewing angles. Results indicated that ideal views, orthogonal to the plane of motion, produced more accurate estimates of posture compared to non-ideal views. The neutral (0 degree) posture was estimated the most accurately even at different viewing angles. Raters were more accurate than model predictions. Findings demonstrate a need for more systematic methods for collecting and analyzing photographic data for observational studies of posture. Renewed caution in interpreting existing studies of wrist posture where viewing angle was not controlled is advised. [Description provided by NIOSH]
• Subjects:
  Biomechanical Phenomena Environmental Monitoring Ergonomics Eye Musculoskeletal System Occupational Health Photography Quality Control Safety Sense Organs
• Keywords:
  Author Keywords: Parallax Biomechanical-modeling Biomechanics Body-mechanics Body-regions Exposure-assessment Extremities Humans Models Motion-studies Physiology Posture Qualitative-analysis Quality-control Quality-standards Viewing Angle Visual-images Visual-motor-performance Wrist

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• ISSN:
  0003-6870
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Journal Article
• Place as Subject:
  Michigan ; OSHA Region 5
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Volume:
  42
• Issue:
  5
• NIOSHTIC Number:
  nn:20039486
• Citation:
  Appl Ergon 2011 Jul; 42(5):634-643
• Contact Point Address:
  Michael H. Lau, Industrial and Operations Engineering, University of Michigan, 1205 Beal Ave., Ann Arbor, MI 48109, USA
• Email:
  laumh@umich.edu
• Federal Fiscal Year:
  2011
• Performing Organization:
  University of Michigan, Ann Arbor
• Peer Reviewed:
  True
• Start Date:
  20050701
• Source Full Name:
  Applied Ergonomics
• End Date:
  20280630
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:7a407de1427add4e3f6855e92e96a413db99f8c72cab88a85ab6a5f5919391c1a9bde4c557bdcf51cd119e7b0141480832e7fe4b4c50e3226e2b9c84a3014ef4
• Download URL:
  https://stacks.cdc.gov/view/cdc/192723/cdc_192723_DS1.pdf
• File Type:
  [PDF - 1.23 MB ]