Vicon IX 2000 L Technical Information PDF herunterladen (Seite 218)

Aspect ratio

Glossary-2 Vicon MX Hardware System Reference

Aspect ratio The proportional width

and height of a picture, expressed in the

format w:h.

Autolabel A process by which Vicon

application software applies a previously

generated autolabel calibration to a saved

trial, identifies individual marker trajecto-

ries, and labels them automatically.

During this offline processing, the Vicon

application software compares the

reconstructed 3D markers in the

3D Workspace to the marker locations

that the autolabel calibration process

stored in the .sp or .vsk file for the

subject. Also see Autolabel calibration,

Marker, .sp file, Subject calibration, and

.vsk file.

Autolabel calibration A process by

which some Vicon application software

identifies the relationship between the

labels defined in the marker (.mkr) or

Vicon skeleton template (.vst) file

associated with a subject and the

reconstructed 3D markers captured in a

trial.

During this offline processing, the Vicon

application software stores the marker

locations in the subject parameters (.sp)

or Vicon skeleton (.vsk) file. The Vicon

application software can then apply this

autolabel calibration to that subject in

subsequent trials.

Some Vicon application software uses the

subject calibration process instead. Also

see Autolabel, .mkr file, Pipeline, .sp file,

Subject calibration, .vsk file, .vst file, and

Workstation.

.avi file Audio Video Interleaved file. A

Microsoft Windows binary file with

extension .avi, which combines

multimedia sound and moving picture

data in a single stream in the Microsoft

RIFF (Resource Interchange File Format)

format. Vicon application software can

play—and optionally generate—.avi files.

Additional compressor/decompressor

(codec) software may be required for

certain .avi files. Also see Reference

video.

B

Ball joint A 3 DOF joint with full

rotational (but not translational) freedom.

This joint type has the position of the

child segment defined from the position

of the parent and joint, but its

orientation can vary freely. This joint type

is typically used to link two segments

that share one marker. Also see Degree

of freedom (DOF), Free joint, Hardy

Spicer joint, Hinge joint, and Slider joint.

Band-pass filter A filter that permits

only signals within a specified range of

frequencies to be passed through. Some

Vicon cameras are fitted with band-pass

interference optical filters that allow the

specific wavelengths of light emitted by

the Vicon strobe units to pass. Also see

Low-pass filter, MX Camera, and Strobe

unit.

Blob In Vicon V-series systems, a

continuous area of above-threshold data

from the camera. Blobs are submitted as

candidates to Vicon circle-fitting

algorithms to determine which are likely

to be markers. Also see Grayscale blob.

Blooming The defocusing of a picture

due to excessive brightness. This can

occur when a Vicon marker is close to a

camera with high sensitivity or whose

aperture is too wide. This can be resolved

by altering sensitivity and/or the aperture

or possibly by moving the camera. Also

see Aperture and Marker.

BNC connector British Naval

Connector (BNC). A durable cable

connector that transfers signals between

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