View Full Version : Summary : Accuracity and precision of 3D MoCap Systems

02-14-2004, 07:17 PM
Dear BIOMCH-L subscribers:

Some weeks ago, I posted a question about how to check accuracity and
precision in MoCap systems.Thank you very much for the replies to my

There isn't any "standardized" method for determining accuracy and
precision. Some methods use specific (and complex) devices in order to test
the accuracy, resolution and repeatability. Some investigators have measured
the distances beetween 2 markers or the angle formed by 3 to validate
systems. Some of them moves a stick with markers through the working area.
Others compare the captured movement with a high precision movement done by
certain devices like plotters, pendulums, etc.

Following is a summary of the references I received:

Ehara Y, H. Fujimoto, S Miyazaki, S Tanaka, S Yamamoto (1995).
"Comparison of the performance of 3D camera systems." Gait and Posture

Ehara Y, H. Fujimoto, S Miyazaki, M Mochimaru, S Tanaka, S Yamamoto(1997).
"Comparison of the performance of 3D camera systems II." Gait and Posture 5:

Laways, L. W., Conlan, T. M., & Miles, J. A. (1996). "Static and dynamic
accuracy determination of a three-dimensional motion analysis system". The
engineering of sport, haake 289-296.

Richards, J.G. (1999). "The mesasurement of human motion: A comparison of
commercially available systems". Hum.Mov.Sci, 18, 589-602.

Miller, et al. "A quasi-static method for determining the characteristics
of a motion capture camera system in a split-volume configuration". Gait
and Posture 2002; 16: 283-7.

Haggard P, Wing AM. "Assessing and reporting the accuracy of position
measurements made with the optical tracking systems". J Motor Behav 1990;
22: 315-321.

Della Croce U, Cappozzo A. "A spot-check for estimating
stereophotogrammetric errors". Med Biol Eng Comput 2000; 38: 260-266.

Holden JP, Selbie S, Stanhope SJ. "A proposed test to support the clinical
movement analysis laboratory accreditation process". Gait Posture 2003; 17:

Wilson DJ, Smith BK, Gibson JK. "Accuracy of reconstructed angular estimates
obtained with the Ariel Performance Analysis System". Phys Therapy. 1997,77,

Wilson DJ, Smith BK, Gibson JK, Choe BK, Gaba BC, Voelz JT. "Accuracy of
digitization using automated and manual methods". Phys Ther. 1999

Klein PJ, DeHaven JJ. "Accuracy of three-dimensional linear and angular
estimates obtained with the Ariel Performance Analysis System" .Arch Phys
Med Rehabil. 1995 Feb;76(2):183-9.

Thanks again for all the replies.

Juan Luis Garrido Castro

Dept. Computing and Numerical Analysis
University of Cordoba

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