Weaving posture analyzing system (WEPAS): introduction and validation

Abstract

As a part of a comprehensive ergonomic study on hand-woven carpet weaving operation, in order to measure working posture, weaving posture analysis system (WEPAS), a two-dimensional video-based system for recording and analyzing weaving posture, based on image processing technology, has been developed. The reproducibility and accuracy of angle measurement obtained by use of WEPAS have been evaluated using a standard goniometer. The low standard deviations (<1°) and insignificant variations due to analysis repetitions indicate high reproducibility of WEPAS. WEPAS accuracy test has revealed that under the defined condition the size of error is small (<±1°). In different combinations of angle and rotation (movement in horizontal plane), the size of errors falls within −3°–1.6° indicating acceptable accuracy for the objective of our study. Low cost of WEPAS, along with its highly reproducible, relatively accurate measurements as well as its easy set-up and calibration have made it applicable system for postural analysis in weaving operation. Relevance to industry This two-dimensional posture analysis system can be applied in hand-woven carpet operation which is an important, widespread profession in Iran. The results of postural variables measurement can then be used to develop guidelines for workstation design to minimize postural strain during weaving operation. With some programming modifications, the system can be applied for posture analysis in other sedentary activities.