9

Camera Tracker: Movie Window 671
accuracy. If the movie was digit ized from film,
you should not perform deinterlacing because
the results will be less accurate. The deinterlacing
is performed temporarily on loaded frames and
doesn’t affect the original movie file.
Off—Disables deinterlacing. When no filtering is
required click this.
Odd—Interpolates using the odd lines.
Even—Interp olates using the even lines.
Fade Display—Fades the movie in a Movie window
by 50 percent. Use t his to see the tracker gizmos
more clearly.
Auto Loa d/ S ave—Saves the state of a tracking
setupandanypositiondatayou’veproducedtoa
specialfileassociatedwitheachmovie.Selecting
Auto Load/Save Settings causes the tracker to keep
this settings file up-to-date automatically as you
work in the tracker. You can force a save at any
timebyclickingtheSavebutton.Wheneveryou
openamoviefileintheCameraTrackerwithAuto
Load/Saveon,thetrackerreloadsthestateofthe
tracking session from this settings file.
With Auto Load/Save Settings on, the tracker
constructs the sett ing file automatically and places
itinthesamefolderasthemovie,namedwiththe
sameprefixasthemoviebutwithfiletypeMOT.If
youmovethemoviefiletoanewfolder,movethe
MOT file with it so the tracker can find it. You can
delete this file if you want to clear the settings or if
thefilebecomescorruptedforanyreason.
When AutoLoad/Save is tur ned off, you can open
adifferentmoviefileeitherwithanemptytracker
state or into the existing tracker state or save the
current tracker state into a new file. The name of
the current tracker file is d isplayed at the bottom
of the Mo vie rollout.
Save—Saves the state of the tracking setup, and any
position data produced to the cur rent MOT file.
Save As—Saves the current setup into a new
MOT file. This file becomes the destination for
subsequent Save operations.
Loa d—Load the tracker setup and position data
from another file.
Cam era Tracker: Movie Wi ndow
The tracker gizmo displayed in the Movie window
consists of two enclosed boxes, a central pair of
cross hairs, and a tracker number. The inner box
surrounds the feature that will be tracked and
is called the feature bounds box.Theouterbox
defines the frame-to-frame search and is called
the motion search bounds box. You should place
the central cross-hair over the feature as close
as possible to the point corresponding to the
placement of its scene point object. It’s this center
coordinate that’s used in the camera match-move
correlation between image feature and scene Point
coordinates.
You should make t he feature bounds box large
enough to enclose the feature and some of the
surroundingimagesenoughtogivethefeaturea
contrasting background of several pix els.