Static and Dynamic Calibration of an Eight-Camera Optical System for Human Motion Analysis

Document Type




Format of Original

11 p.

Publication Date



Begell House

Source Publication

Critical Reviews in Physical and Rehabilitation Medicine

Source ISSN


Original Item ID

doi: 10.1615/CritRevPhysRehabilMed.v22.i1-4


An eight-camera Optitrack motion capture system was evaluated by performing static, linear dynamic, and angular dynamic calibrations using marker distances associated with upper and lower extremity gait and wheelchair models. Data were analyzed to determine accuracy and resolution within a defined capture volume using a standard Cartesian reference system. Static accuracy ranged from 99.31 to 99.90%. Static resolution ranged from 0.04 ± 0.15 to 0.63 ± 0.15 mm at the 0.05 level of significance. The dynamic accuracy ranged from 94.82 to 99.77%, and dynamic resolution ranged from 0.09 ± 0.26 to 0.61 ± 0.31 mm at the 0.05 level of significance. These values are comparable to those reported for a standard Vicon 524 (Oxford Metrics, Oxford, England) motion analysis system. The results support application of the lower cost Optitrack system for 3D kinematic assessment of upper and lower extremity motion during gait, assisted ambulation, and wheelchair mobility.


Critical Reviews™ in Physical and Rehabilitation Medicine, Vol. 22, No. 1-4 (2012): 49-59. DOI. © Begell House 2012.