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Measurement of upper extremity orientation by video stereometry system
1Division of Mechanics, Chalmers University of Technology, Göteborg, Sweden.
Medical & Biological Engineering & Computing
|March 1, 1996
Summary
This study assesses errors in a video-based stereometry system for upper limb posture analysis. The system offers adequate accuracy for non-contact ergonomic and biomechanical measurements.
Area of Science:
- Biomechanics
- Ergonomics
- Sports Medicine
Background:
- Work-related shoulder pain necessitates accurate arm position monitoring.
- Video-based stereometry systems with infra-red light and markers are used for motion analysis.
- Existing methods for posture registration have varying accuracy.
Purpose of the Study:
- Investigate sources of error in video-based stereometry for upper limb posture.
- Evaluate system accuracy in ergonomic and biomechanical applications.
- Identify limitations in marker positioning and object alignment.
Main Methods:
- Measurements conducted on a calibration fixture, mechanical upper limb model, and subject with exoskeleton.
- Analysis of errors related to marker geometrical precision.
- Assessment of alignment inconsistencies and angular measurement errors.
Main Results:
- Identified errors stem from marker positioning precision and object alignment.
- Angular measurement inaccuracies contribute to overall system error.
- The system demonstrates adequate accuracy for non-contact posture measurement in typical use.
Conclusions:
- The video-based stereometry system is a valuable tool for non-contact posture measurement.
- System accuracy is adequate for upper limb posture registration in normal handling.
- Understanding error sources is key to optimizing its application in ergonomics and biomechanics.