OpenSense IMU Calibration Pose
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Allison Porter
- Posts: 12
- Joined: Thu Jan 10, 2019 3:53 pm
OpenSense IMU Calibration Pose
I would like to try processing IMU data using OpenSense. My subject had 8 sensors (2 feet, 2 shank, 2 thigh, sacrum, sternum) to look at lower body kinematics. I noticed on the OpenSense page, it says you must have a known calibration pose. I took a calibration pose in a separate recording as my trials (1 ~5 second static calibration, followed by 12 trials). Can I use this separate file for calibration, or does OpenSense only work if the calibration pose is in the same recording as the trial?
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Ayman Habib
- Posts: 2248
- Joined: Fri Apr 01, 2005 12:24 pm
Re: OpenSense IMU Calibration Pose
Hi Allison,
OpenSense assumes that you "know" the calibration pose in the sense that you can set the default pose of the OpenSim model you're using to match the pose at which the calibration trial was collected. The pose itself is arbitrary, however, so if you have a calibration pose with the subject sitting or in any self selected pose you can do the calibration as long as you set your model's coordinates to make that pose the default.
At the end of calibration (now called IMU-Placement) you have a model with IMUs placed on the corresponding segments and that are properly oriented. From then on you can use this model for arbitrary trials as long as the IMUs are placed the same.
Hope this helps,
-Ayman
OpenSense assumes that you "know" the calibration pose in the sense that you can set the default pose of the OpenSim model you're using to match the pose at which the calibration trial was collected. The pose itself is arbitrary, however, so if you have a calibration pose with the subject sitting or in any self selected pose you can do the calibration as long as you set your model's coordinates to make that pose the default.
At the end of calibration (now called IMU-Placement) you have a model with IMUs placed on the corresponding segments and that are properly oriented. From then on you can use this model for arbitrary trials as long as the IMUs are placed the same.
Hope this helps,
-Ayman