System information

Vicon MX Hardware System Reference Glossary-1
Glossary
Numerics
3D Workspace A type of view pane in
a Vicon application software window in
which reconstructed data from all active
cameras is displayed in 3D (three-
dimensional) perspective, that is length,
width, and depth. Also see View pane.
A
Accessory kit A collection of
specialized Vicon accessories for use with
its motion capture systems. The kit
typically contains items such as marker
fixing tape, licensing dongles, Velcro™,
Lycra™ suit, and retroreflective markers.
Activity bar A tabbed pane on the right
side of an operating mode in a Vicon iQ or
Tracker application software window. An
activity bar provides the tools and
functions relating to the current operating
mode. Also see Control bar and Operating
mode.
ADC option card An Analog-to-Digital
Converter (ADC) device for converting
voltage to a digital value that represents
the signal at the instant at which it was
sampled. Analog or audio ADC option
cards are used to integrate a third-party
device for capturing analog or audio data
into a Vicon system.
Algorithm A well-defined procedure
that transforms one or more given input
variables into one or more output
variables in a finite number of steps.
Alias An association between a virtual
point and one or more markers whose
gaps are to be filled using a virtual points
fill operation in some Vicon application
software. Also see Marker and Virtual
point.
Analog A voltage that is limited to a
maximum range of ±10 v and can option-
ally be captured by Vicon systems, such
as force plates, EMG measurements, or
audio data. Also see ADC option card,
Datastation, EMG, Force plate,
MX Control, Scale factor (analog), and
.vad file.
Analog sampling frequency The rate
(in Hertz) at which samples of analog
data are taken. The higher the sampling
frequency (that is, the more samples
taken per second), the more closely the
digitized data resembles the original
data. Also see Analog.
Analog sensor An electronic device
that produces a voltage proportional to
the measured quantity, which must then
be converted to a digital format by an
ADC device before a computer can
process it. Also see ADC option card,
Force plate, Reference video, and Sensor.
Angle of view The total area,
expressed as an angle, that the camera
lens can reproduce as a sharp, focused
image. Also see Field of view.
Aperture The diameter of the camera
lens opening, which determines the
amount of light that can pass through the
lens in a given time. The size of the lens
opening is controlled by an iris and is
expressed in f-stop values (f1.4, f2, f2.8,
f4, f5.6, f8, f11, f16, f22).
Typically, each f-stop value represents a
50 percent change in the amount of light.
Smaller f-stop values represent wider
apertures that allow more light to pass
through. Larger f-stop values represent
narrower apertures that allow less light to
pass through. Also see Depth of field and
Field of view.
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