System information

Vicon MX Hardware System Reference Glossary-17
systems. Also see Also see MX Camera,
MX+ Camera, and Vicon MX.
MX40/MX40+ An MX camera
providing 4 mega-pixel resolution used in
Vicon MX systems. Also see MX Camera,
MX+ Camera, and Vicon MX.
.mxe file A file with extension .mxe,
which contains updates to the Vicon MX
firmware in MX cameras and certain
MX hardware units. Also see Firmware,
MX Bridge, MX Camera, MX Control,
MX Sync, and MX Ultranet.
N
Neutral pose The anatomical position
in which a subject maintains a stationary
stance. In this type of pose, the subject
typically stands upright with the head
level and looking straight ahead,
shoulders relaxed (neither hunched
forward nor pressed backward), arms
hanging loosely by the sides with wrists
straight and palms facing inward, pelvis
level, and feet flat on the floor and
pointing forward.
The actual posture depends upon the
definition of the zero position for key
joints in the kinematic model described in
the associated .vst file. A neutral pose is
using during a static trial or at the
beginning of a dynamic trial. Two
common forms of the neutral pose are
the motorcycle pose and the T-pose. Also
see Dynamic trial, Motorcycle pose, Static
trial, and T-pose.
Nexus Vicon application software for
optical motion capture, processing, and
analysis with Vicon MX systems. It
contains functionality to prepare, acquire,
and review the movement of live subjects
and inanimate objects. Nexus replaced
Workstation as the core motion capture
and processing software for life sciences
applications. Also see Vicon MX and
Workstation.
Noise Random or systematic
background interference that is unrelated
to the data being collected (such as hum
or hiss in audio data, or snow or
graininess in video data), or random
spikes or jitters in motion data. Some
noise is generally present in most data
collected. Typical examples are noise
caused by human error in digitizing,
electrical interference in EMG, mechanical
vibrations in force plates, or non-
seamless camera tracking of markers
during motion capture. Different types of
noise require different techniques to
eliminate it.
Normalization scheme A set of events
within a context defined for a trial, which
is used to normalize graph data in some
Vicon application software. Graphs are
plotted using a horizontal axis which is
determined by two events. This enables
graphs from different trials to be
compared. Also see Context.
NTSC National Television System
Committee. A format defined for analog
color television, with a vertical resolution
of 525 lines and a base frame rate of
29.97 Hz. This is the format used in
Canada, Japan, Korea, Mexico, USA, and
parts of Central and South America. NTSC
uses the SMPTE timecode standard. Also
see EIA, LTC, PAL, SECAM, SMPTE
timecode, Timecode, and VITC.
O
.obd file A text file with extension .obd,
which contains information on fixed
objects (such as furniture) in the capture
volume. This enables such objects to be
visualized in Vicon Workstation. You can
use the default .obd files supplied in the
Workspace directory (by default,
C:\Program Files\Vicon\Workstation
MXhardware_Reference.book Page 17 Thursday, September 7, 2006 11:36 AM