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visual3d:documentation:definitions:motion_capture_mocap [2024/11/15 17:11] – Added an overview of motion capture in general. Updated the list of vendors to HAS-Motion's current partners. Added both internal and external links. wikisysopvisual3d:documentation:definitions:motion_capture_mocap [2024/11/15 19:57] (current) – wikisysop
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 ===== Motion Capture ===== ===== Motion Capture =====
  
-Motion capture (informally "mo-cap" or "mocap") involves the recording of movement from the real world. In a biomechanical context this recording is performed using a validated and calibrated measurement system. The movement in question is often human movement, but easily extends to animal movement (including horses, dogs, cats, and goats) and robots.+Motion capture (informally "mo-cap" or "mocap") involves the recording of movement from the real world. In a biomechanical context this recording is usually performed using a validated and calibrated measurement system. The movement in question is often human movement, but easily extends to animal movement (including horses, dogs, cats, and goats) and robots.
  
 ==== Types of Motion Capture ==== ==== Types of Motion Capture ====
  
-There are several different approaches to recording and measuring human movement, each with their own strengths and weaknesses. This section provides a brief overview for these approaches but is in no way comprehensive. Users are highly recommended to conduct their own research to determine which motion capture approach is best suited to the questions they are trying to answer.+There are several different data collection modalities for recording and measuring human movement, each with their own strengths and weaknesses. This section provides a brief overview for these approaches but is in no way comprehensive. Users are highly recommended to conduct their own research to determine which motion capture approach is best suited to the questions they are trying to answer.
  
 === Marker-based Motion Capture === === Marker-based Motion Capture ===
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 Marker-based motion capture systems can be further subdivided into passive and active systems. Marker-based motion capture systems can be further subdivided into passive and active systems.
  
-Passive marker-based systems generally use retroflective markers placed on the body in accordance with a particular [[visual3d:documentation:modeling:marker_sets:marker_sets_overview|marker set]]. Cameras are set up to record the infrared light reflected by these markers and estimate the 3-dimensional position of these markers throughout the movement. A model providing these marker positions with biomechanical meaning is defined by the user and this model is applied to the recorded 3D marker positions during dynamic movements of interest to produce [[visual3d:documentation:kinematics_and_kinetics:pose_estimation|pose estimates]]. There are a [[visual3d:documentation:modeling:marker_sets:marker_placement|number of considerations]] to keep in mind when selecting a marker set and placing markers.+Passive marker-based systems generally use retroflective markers placed on the body in accordance with a particular [[visual3d:documentation:modeling:marker_sets:marker_sets_overview|marker set]]. Cameras are set up to record the near infrared light reflected by these markers and estimate the 3-dimensional position of these markers throughout the movement. A model, essentially a mapping from markers to the skeleton, providing these marker positions with biomechanical meaning is defined by the user and this model is applied to the recorded 3D marker positions during dynamic movements of interest to produce [[visual3d:documentation:kinematics_and_kinetics:pose_estimation|pose estimates]]. There are a [[visual3d:documentation:modeling:marker_sets:marker_placement|number of considerations]] to keep in mind when selecting a marker set and placing markers.
  
 Active marker-based systems generally use markers that emit light, which are again placed on the body. Cameras record the light emitted by these markers and estimate their 3-dimensional position throughout the movement. Active marker-based systems generally use markers that emit light, which are again placed on the body. Cameras record the light emitted by these markers and estimate their 3-dimensional position throughout the movement.
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 === Inertial Measurement Units === === Inertial Measurement Units ===
  
-[[https://en.wikipedia.org/wiki/Inertial_measurement_unit|Inertial measurement units]] are strapped to participants or otherwise worn and combine accelerometers and gyroscopes to estimate the pose of the associated segment.+[[https://en.wikipedia.org/wiki/Inertial_measurement_unit|Inertial measurement units]] are strapped to participants or otherwise worn and combine accelerometers, gyroscopes and sometimes magnetometers. These signals are fused to estimate the pose of the associated segment.
  
 Visual3D is able to process data from IMU systems that write out an [[visual3d:documentation:third-party:xsens:xsens|MVNX]] file. Visual3D is able to process data from IMU systems that write out an [[visual3d:documentation:third-party:xsens:xsens|MVNX]] file.
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   * [[https://www.amti.biz/|AMTI]]   * [[https://www.amti.biz/|AMTI]]
   * [[https://www.bertec.com/|Bertec]]   * [[https://www.bertec.com/|Bertec]]
 +  * [[https://www.btsbioengineering.com/|BTS]]
   * [[https://delsys.com/|Delsys]]   * [[https://delsys.com/|Delsys]]
   * [[https://www.fujitsu.com/global/|Fujitsu]]   * [[https://www.fujitsu.com/global/|Fujitsu]]
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   * [[https://www.noraxon.com/|Noraxon]]   * [[https://www.noraxon.com/|Noraxon]]
   * [[Visual3D:Documentation:Third-Party:Natural_Point:Natural_Point_Overview|Natural Point]] [[https://optitrack.com/|Optitrack cameras]] (**[[other:visual3dserver:plugins:rt_plugin_motive|RT]]**)   * [[Visual3D:Documentation:Third-Party:Natural_Point:Natural_Point_Overview|Natural Point]] [[https://optitrack.com/|Optitrack cameras]] (**[[other:visual3dserver:plugins:rt_plugin_motive|RT]]**)
 +  * [[https://www.phasespace.com/|Phase Space]]
   * [[https://www.qualisys.com/|Qualisys]] (**[[Visual3D:Tutorials:Real_Time:Biofeedback:Qualisys_QTM|RT]]**)   * [[https://www.qualisys.com/|Qualisys]] (**[[Visual3D:Tutorials:Real_Time:Biofeedback:Qualisys_QTM|RT]]**)
   * [[https://www.theiamarkerless.ca/|Theia Markerless]]   * [[https://www.theiamarkerless.ca/|Theia Markerless]]
 +  * [[https://www.treadmetrics.com/|TreadMetrics]]
   * [[https://www.vicon.com/|Vicon]] (**[[Visual3D:Documentation:Third-Party:Vicon:Vicon_Overview|RT]]**)   * [[https://www.vicon.com/|Vicon]] (**[[Visual3D:Documentation:Third-Party:Vicon:Vicon_Overview|RT]]**)
  
  
  
visual3d/documentation/definitions/motion_capture_mocap.1731690715.txt.gz · Last modified: 2024/11/15 17:11 by wikisysop