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aremazeilles / beat_routine

Performance Indicators developed by BEAT consortium for the Eurobench project
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File format: jointAngle #29

Open aremazeilles opened 4 years ago

aremazeilles commented 4 years ago

From #26:

In the documentation, we now refer to this figure

On one side, in the jointAngle file, we suggest using _x, _y, and _z for the three angles (named cardan angles). In your file here, you use flexion, adduction and rotation. Should we permit both, or migrate to a single format? Actually, for some other angles, other terms are used, like obliquity for the head.

Then, I could see pelvic, that we do not have on our figure. I guess we should add it, correct @juritaborri

@juritaborri answered:

  • I agree to use _x _y and _z rather than flexion, adduction and rotation. It is only important that users know which is the actual physiological meaning of x, y and z.
    • Pelvic is a little bit different, from a physiological point of view, from hip; thus, it is desirable to add it in the document.
aremazeilles commented 4 years ago

Actually, in the angle definition, we see similar terms used for some angles. And we defined the labels using similar terms. I am a bit confused there. @alfonsotecnalia , should we check that with David and others to see what we do.

Regarding pelvic, it seems we have it defined within the waist description, while we do not have it in the general joint center name figure.

alfonsotecnalia commented 4 years ago

These paragraphs from the Vicon documentation could help with the goniometric description (flexion/abduction/rotation) of YXZ:

Plug-in Gait uses Cardan angles, modified in the case of the ankle angles, to represent both

  • Absolute rotations of the pelvis and foot segments and

  • Relative rotations at the hip, knee, and ankle joints

.... The output angles for all joints are calculated from the YXZ Cardan angles... …. A joint angle is then defined using the following ordered rotations:

  • The first rotation (flexion) is made about the common flexion axis. The other two axes, abduction and rotation, are afterwards no longer aligned in the two elements.

  • The second rotation (abduction) is made about the abduction axis of the moving element.

  • The third rotation (rotation) is made about the rotation axis of the moving element.

I think that adding reference frames to the figures could also help.

juritaborri commented 4 years ago

Can I change the label with _x, _y and _z as discussed with Matteo?

aremazeilles commented 3 years ago

Sorry to be late on this. Can you just wait that I write the description of the mapping with xyz in the documentation, to make sure we do agree?