pyCGM_Single.pycgmStatic.headJC

pyCGM_Single.pycgmStatic.headJC(frame)

Calculate the head joint axis function.

Takes in a dictionary of x,y,z positions and marker names. Calculates the head joint center and returns the head joint center and axis.

Markers used: LFHD, RFHD, LBHD, RBHD

Parameters

framedict

Dictionary of marker lists.

Returns

head_axis, originlist

Returns a list containing a 1x3x3 list containing the x, y, z axis components of the head joint center and a 1x3 list containing the head origin x, y, z position.

Examples

>>> import numpy as np
>>> from .pycgmStatic import headJC
>>> frame = {'RFHD': np.array([325.83, 402.55, 1722.5]),
...          'LFHD': np.array([184.55, 409.69, 1721.34]),
...          'RBHD': np.array([304.4, 242.91, 1694.97]),
...          'LBHD': np.array([197.86, 251.29, 1696.90])}
>>> [np.around(arr, 2) for arr in headJC(frame)] 
[array([[ 255.22,  407.11, 1722.08],
        [ 254.19,  406.15, 1721.92],
        [ 255.18,  405.96, 1722.91]]), array([ 255.19,  406.12, 1721.92])]