Systematic accuracy and precision analysis of video motion capturing systems—exemplified on the Vicon-460 system

Windolf, Markus; Götzen, Nils; Morlock, Michael M.

doi:10.1016/j.jbiomech.2008.06.024

Cited by 338 publications

(226 citation statements)

References 4 publications

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“…Overall system accuracy was 63±5µm and noise level of 15 µm, but during some cases because of dynamic calibration or arbitrary settings accuracy could be lower [11].…”

Section: Methodsmentioning

confidence: 99%

Characteristic upper extremity kinematic parameters of healthy people during defined motions

Linkel

Griškevičius

Shippen

et al. 2016

Proccedings of 11th International Conference Biomdlore 2016

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Abstract. One of most common ways to examine the quality of the patient's upper extremity (UE) function is measuring the movement's kinematic parameters during the motion. However, is it reliable to compare a patient's UE motions data with healthy people's characteristic parameters? In this paper is shown that intrapersonal coefficient of variability (CV) in angles amplitudes differs from 3.2% during elbow flexion to 52.9% during wrist abduction and CV in angular velocity differs from 22.1% during shoulder abduction to 66.3% during wrist abduction.Keywords: upper extremity, objective parameters, motion capturing system, biomechanics. IntroductionThe loss of UE function is one of the most common results after Central Nervous System (CNS) injuries It is clear that only functional and clinical subjective scales are not enough for accurate motion quality measurements and that objective methods are required. Quantitative measures of UE movement's quality can be valuable in the rehabilitation field for evaluating the quality of actual motion and recovery progress [10] which might help physicians to compare accurately healthy and pathological movement conditions in a clinical setting. The purpose of the research was to find if particular kinematic parameters of healthy participant's UE motions are reliable to compare with further experiments results with patients who have UE disability and trying to recover previous movement's conditions.

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“…Overall system accuracy was 63±5µm and noise level of 15 µm, but during some cases because of dynamic calibration or arbitrary settings accuracy could be lower [11].…”

Section: Methodsmentioning

confidence: 99%

Characteristic upper extremity kinematic parameters of healthy people during defined motions

Linkel

Griškevičius

Shippen

et al. 2016

Proccedings of 11th International Conference Biomdlore 2016

View full text Add to dashboard Cite

show abstract

“…This is not surprising, when considering the recording frequencies of both systems. The MIK is a very fast movement and the sampling rate of the movement analysis system (240 Hz) might be inadequate to capture such a fast movement (Windolf, Gotzen, & Morlock, 2008). The foot switch system samples with 1000 Hz.…”

Section: Validitymentioning

confidence: 99%

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2015

JPES

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Abstract:Aim of this single-case study was to investigate the feasibility and the validity of the use of Footswitch System (FS) during maximal instep kick (MIK). One participant conducted 25 MIK's simultaneously recorded by both systems. The MIK was divided into three time phases and total phase and were measured in milliseconds. Feasibility outcome was the time schedule. Validity was examined with ICC and the Bland-Altman method. Total measuring time was 3 hours and 10 minutes. 27% of 25 MIK's were usable for evaluation. Systematic biases are determined for all phases. Negative bias for phase 1 (-7.1 ms), phase 3 (-3.6 ms) and MIK (-4.9 ms) and positive bias for phase 3 (5.9 ms) are presented. The authors conclude that the actual investigation protocol is not feasible for measuring the MIK and should be modified.

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“…Accuracy decreases significantly when using an optical lens filter. Optical motion capture provides precise measurement tools for biomechanical applications [9]. Marker placement, which differs from examiner to examiner, is identified as the largest source of variability in the evaluation of kinematic parameters.…”

Section: Introductionmentioning

confidence: 99%

Repeatability of the three dimensional kinematics of the pelvis, spine and lower limbs while performing selected exercises

Skublewska‐Paszkowska

Lukasik

Smółka

et al. 2017

ITM Web Conf.

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Abstract. Three-dimensional optical systems are used for calculating many kinetic and kinematic parameters. The obtained data are precise; however, their repeatability is a very important aspect. The aim of this paper is to verify the range of motion repeatability of one healthy subject in the joints of the pelvis, spine and lower limbs based on the coefficient of variation. The participant performed seven exercises, repeated five times: two-leg squat, single-leg squat, forward bending, forward-step motion, step onto the stair, hip extension in a standing position and tip-toe extension while standing. Motion was recorded using Vicon motion capture system consisting of eight NIR cameras. The participant had 39 markers attached to her body according to the Plug-in Gait model. The coefficient of variation was calculated in three dimensions (X, Y and Z). The greatest repeatability, pursuant to the coefficient, was observed during the two-leg squat and forward bending in the sagittal plane (X coordinate). It was also high during the singleleg squat. The lowest repeatability was observed during the tip-toe extension while standing and the hip extension in a standing position. During the step onto the stair and the forward-step motion, a higher repeatability of measurement occurred in the open kinematic chain than in the closed chain; in the hip extension the reverse occurred. Repeatability of a range of motion is different in two types of kinematic chain and in 7 exercises. Exercises such as tip-toe extension and hip extension, which require a greater ability to balance, indicated more variability in movement.

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Systematic accuracy and precision analysis of video motion capturing systems—exemplified on the Vicon-460 system

Cited by 338 publications

References 4 publications

Characteristic upper extremity kinematic parameters of healthy people during defined motions

Characteristic upper extremity kinematic parameters of healthy people during defined motions

Untitled

Repeatability of the three dimensional kinematics of the pelvis, spine and lower limbs while performing selected exercises

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