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Kinematics

Glossary-14 Vicon MX Hardware System Reference

Vicon system are contained in Vicon

Skeleton Template (.vst) and Vicon

Skeleton (.vsk) files. A representation of

the kinematic model for a subject can be

displayed in the 3D Workspace. Also see

Kinematics, Kinematic fitting, .vsk file,

and .vst file.

Kinematics The study of motion

without reference to its cause or its mass.

Vicon application software is concerned

with angular and linear displacements,

velocity, and acceleration. Also see

Forward kinematics and Inverse

kinematics.

Kinetics The study of the changes in

motion as a result of external factors,

including internal forces (muscle activity,

ligaments or friction in muscles and

joints) and external forces (ground or

external loads). Vicon application

software is concerned with kinetic forces,

moments (torque), and power. Also see

Force, Forward dynamics (kinetics),

Inverse dynamics (kinetics), and

Moment.

L

L-frame A type of static calibration

object. Also referred to as an ergo

calibration frame. Also see Static

calibration object and Ergo calibration

frame.

Label A name by which a point or the

trajectory of a marker is identified in

Vicon application software. The labels to

be used to identify the reconstructed

3D markers are defined in kinematic

model (.vst or .vsk file) for the subject or

in the associated marker (.mkr) file. Also

see Marker, .mkr file, Trajectory, .vsk

file, and .vst file.

LAN Local Area Network. A short-

distance data communications network—

typically within a single building or group

of buildings—used to connect computers

in order to share data and peripheral

devices (such as printers, CD-ROM

drives, and modems). Each device on a

LAN is known as a node; nodes are

connected by cables through which

messages are transmitted. Also see

Ethernet network.

LEMO® connector An electronic

connector for attaching electro-optic

devices. Connects with a push-pull self-

latching mechanism. Also see BNC

connector.

Limp index A temporal parameter used

in gait analysis for the total support

(single + double) for the current foot

divided by the total support for the

opposite foot. For a symmetric walk, the

limp index is exactly one. Also see Double

support, Gait analysis, and Single

support.

Live 3D Workspace See

3D Workspace.

Local coordinate system A coordinate

system whose origin (0,0,0) and axes

(x,y,z) are fixed with respect to a

particular segment or element in a

kinematic model, as opposed to the

global origin and axes directions. Also see

Capture volume, Global coordinate

system, Kinematic model, Volume origin,

and Workspace axes.

Low-pass filter A filter that permits

only signal components below a specified

frequency to be passed through. Some

Vicon cameras are fitted with low-pass

absorptive optical filters that allow low-

frequency light from Vicon strobe units to

pass. Also see Band-pass filter,

MX Camera, and Strobe unit.

LTC Longitudinal Timecode. A form of

timecode compatible with standard audio

channels so that they can be recorded

onto an audio tape track or an audio track

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