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Validation of enhanced kinect sensor based motion capturing for gait assessment

View Article: PubMed Central - PubMed

ABSTRACT

Optical motion capturing systems are expensive and require substantial dedicated space to be set up. On the other hand, they provide unsurpassed accuracy and reliability. In many situations however flexibility is required and the motion capturing system can only temporarily be placed. The Microsoft Kinect v2 sensor is comparatively cheap and with respect to gait analysis promising results have been published. We here present a motion capturing system that is easy to set up, flexible with respect to the sensor locations and delivers high accuracy in gait parameters comparable to a gold standard motion capturing system (VICON). Further, we demonstrate that sensor setups which track the person only from one-side are less accurate and should be replaced by two-sided setups. With respect to commonly analyzed gait parameters, especially step width, our system shows higher agreement with the VICON system than previous reports.

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Related in: MedlinePlus

Arrangement of the Kinect sensors illustrating the overlapping tracking volumes.Sensors were arranged using this pattern but then spatially calibrated to achieve high precision. The theoretical length of the tracking volume in walking direction using this setup is about 9 meters. The Kinect sensors were arranged in a way ensuring that the VICON tracking volume was completely covered.
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pone.0175813.g004: Arrangement of the Kinect sensors illustrating the overlapping tracking volumes.Sensors were arranged using this pattern but then spatially calibrated to achieve high precision. The theoretical length of the tracking volume in walking direction using this setup is about 9 meters. The Kinect sensors were arranged in a way ensuring that the VICON tracking volume was completely covered.

Mentions: Six Kinect sensors were arranged as an avenue (Fig 4) in order to cover the tracking volume of the VICON system. We placed the sensors pairwise in rows along the walking direction for two reasons: (1) reduction of self-occlusions of the tracked person and (2) more accurate tracking. The theoretical length of the tracking volume is about 9 meters of which we used the overlapping 6 meters with the VICON setup.


Validation of enhanced kinect sensor based motion capturing for gait assessment
Arrangement of the Kinect sensors illustrating the overlapping tracking volumes.Sensors were arranged using this pattern but then spatially calibrated to achieve high precision. The theoretical length of the tracking volume in walking direction using this setup is about 9 meters. The Kinect sensors were arranged in a way ensuring that the VICON tracking volume was completely covered.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5391956&req=5

pone.0175813.g004: Arrangement of the Kinect sensors illustrating the overlapping tracking volumes.Sensors were arranged using this pattern but then spatially calibrated to achieve high precision. The theoretical length of the tracking volume in walking direction using this setup is about 9 meters. The Kinect sensors were arranged in a way ensuring that the VICON tracking volume was completely covered.
Mentions: Six Kinect sensors were arranged as an avenue (Fig 4) in order to cover the tracking volume of the VICON system. We placed the sensors pairwise in rows along the walking direction for two reasons: (1) reduction of self-occlusions of the tracked person and (2) more accurate tracking. The theoretical length of the tracking volume is about 9 meters of which we used the overlapping 6 meters with the VICON setup.

View Article: PubMed Central - PubMed

ABSTRACT

Optical motion capturing systems are expensive and require substantial dedicated space to be set up. On the other hand, they provide unsurpassed accuracy and reliability. In many situations however flexibility is required and the motion capturing system can only temporarily be placed. The Microsoft Kinect v2 sensor is comparatively cheap and with respect to gait analysis promising results have been published. We here present a motion capturing system that is easy to set up, flexible with respect to the sensor locations and delivers high accuracy in gait parameters comparable to a gold standard motion capturing system (VICON). Further, we demonstrate that sensor setups which track the person only from one-side are less accurate and should be replaced by two-sided setups. With respect to commonly analyzed gait parameters, especially step width, our system shows higher agreement with the VICON system than previous reports.

No MeSH data available.


Related in: MedlinePlus