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Subject calibration

Glossary-26 Vicon MX Hardware System Reference

2) The 3D representation of the person,

animal, or object whose motion is being

captured or analyzed in a Vicon system.

This is a visualization of the calibrated

Vicon Skeleton (.vsk) file for a specific

subject. Individual elements of the

subject can be visualized in 3D: Bones,

Segment Axes, Marker, Stick, Bounding

box, and Parameter links.

3) A node in the hierarchy of a database

based on the generic Eclipse Node

Initialization (.eni) template file. This

equates to the Patient node in the Clinical

template and the Capture Day node in

the Animation template. Also see Eclipse

database and .eni file.

4) A collection of files named after the

trial subject. Also see .sp file, .mkr file,

and .vsk file.

Subject calibration The process by

which the Vicon application software

creates or modifies a kinematic model for

a specific subject.

During this processing, the Vicon

application software compares the

physical segments, joints, and markers

on the trial subject to either a) the

definition of segments, joints, and

markers in the generic model for the

subject type described in the associated

Vicon Skeleton Template (.vst) file in

Vicon iQ or b) marker locations in a

previously manually labeled trial for that

subject in Workstation.

The results of subject calibration are

stored in a subject-specific Vicon

Skeleton (.vsk) file, which is used to

automatically track and label segments

and marker trajectories for the subject in

in the 3D Workspace. Also see Autolabel

calibration, Kinematic model, Marker,

Segment, Trajectory, .vsk file, and .vst

file.

SV Cam A small format, wide-angle

lens CMOS digital sensor camera used in

a Vicon V-series system. This type of

camera is the same specification as a

VCam camera, but with a reduced strobe

size. Also see CMOS and VCam.

Synchronization The process by which

a signal change common to all camera

view and analog signals is used to match

them in time. This causes analog and/or

video data from different sources to

match exactly. Also see Analog,

Datastation, and MX Control.

System calibration See Camera

calibration.

.system file An XML file with extension

.system, which contains configuration

settings for Vicon system hardware

managed by Nexus application software.

This file is created in the System browser

pane in Nexus. Also see Nexus.

T

T-pose A form of the neutral pose used

when capturing a static trial in

Workstation or starting a RoM trial in

Vicon iQ and Nexus application software.

In this pose, the subject stands in the

basic neutral pose and raises the arms

out straight to the sides with palms facing

down (in a position in the shape of a T).

This type of static trial may be required

for the autolabel or the subject calibration

process. Also see Autolabel calibration,

Neutral pose, Motorcycle pose, RoM trial,

Static trial, and Subject calibration.

Tail An inaccurate reconstruction for a

marker trajectory that occurs

immediately before and after gaps. Tails

can occur when a marker is partially

occluded (or blocked) from the camera’s

view during motion capture, thus

resulting in unreliable data for that

marker during that period of time. Tails

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