Vicon IX 2000 L Technical Information PDF herunterladen (Seite 227)

Frame

Vicon MX Hardware System Reference Glossary-11

connecting those elements. This is a fully

determined problem with a unique

solution. Also see Forward dynamics

(kinetics), Inverse dynamics (kinetics),

Inverse kinematics, and Kinematics.

Frame A complete video picture

composed of two scanned fields at a

specific period of time in a continuous

video signal. For example PAL video

contains 25 frames per second, and each

of these frames is made up of two fields

that together contain 625 horizontal lines

of video information. For non-interlaced

data, a frame is synonymous with a field.

For interlaced data, a frame is composed

of two fields: one even and one odd. Also

see Field, Frame number, Frame rate,

NTSC, PAL and Progressive video.

Frame number The sequential number

assigned to each frame of a video. Also

see Frame and Timecode.

Frame rate The number of times a

second the picture is updated to provide

the illusion of continuous movement. Also

thought of as the speed at which video

cameras capture data, frame rate is

measured in either frames per second

(fps) or camera frequency in Hertz. The

camera frame rate can be configured in

Vicon application software. In .avi files,

the frame rate refers to the rate at which

the video will be played back. Also see

.avi file, Frame, and Frame rate view

pane.

Frame rate view pane A type of view

pane in a Vicon iQ application software

window in which a range of diagnostic

real-time graphing views for all active

cameras can be displayed: frame rate,

mean residual, marker residual, marker

separation. Also see Frame rate and View

pane.

Free joint A 6 DOF joint with full

translational as well as rotational

freedom. In Vicon .vst/.vsk files, this

joint type is typically used to link two

segments that do not share any markers.

It is used for the root segment to allow it

to move freely with respect to the global

origin; you can not change the root’s

joint type. Also see Ball joint, Degree of

freedom (DOF), Hardy Spicer joint, Hinge

joint, Slider joint, .vsk file, and .vst file.

Fullscreen preview A type of view

pane in some Vicon application software

in which the unthresholded, full grayscale

image from the entire CMOS sensor in an

MX Camera is displayed. Also see CMOS

and Grayscale blob.

G

Gain A multiplicative increase (or

decrease) in a voltage or digital signal by

a specified magnitude. Adjusting the gain

in a Vicon camera increases or decreases

the intensity of a marker displayed in the

workspace. Also see Marker and

Workspace.

Gait analysis The study of human

movement for medical purposes. Vicon

application software can record and

analyze such data to generate kinematic

and kinetic data. Also see Force plate,

Kinematics and Kinetics.

Gap An absence of one or more

reconstructions for a marker trajectory. A

gap can occur when a marker is fully

occluded (or blocked) from the camera’s

view during motion capture, thus

resulting in missing data for that marker

during that period of time. Gaps can be

filled using editing tools in Vicon

application software. Also see

Reconstruction, Tail, and Trajectory.

Genlock The process of sync generator

locking. A genlock device enables a

composite video signal from a master

source to be introduced to the subject

sync generator. The generator to be

MXhardware_Reference.book Page 11 Monday, April 30, 2007 1:56 PM

1 2 ... 222 223 224 225 226 227 228 229 230 231 232 ... 255 256

Kommentare zu diesen Handbüchern

Keine Kommentare