5

Bottom Right: Available when four-point tracking is enabled (when Four Corners is
chosen from the Type pop-up menu) and the Match Move behavior references another
behavior (such as Analyze Motion), this pop-up menu allows you to select the tracker
from the referenced behavior you want to apply as the bottom right tracker.
Bottom Left: Available when four-point tracking is enabled (Four Corners is chosen from
the Type pop-up menu) and the Match Move behavior references another behavior (such
as Analyze Motion), this pop-up menu allows you to select the tracker from the referenced
behavior you want to apply as the bottom left tracker.
HUD Controls
The Match Move HUD contains controls to load an animated object or tracking data from
another tracking behavior (via the Source well or the tracking behaviors pop-up menu),
to start the motion analysis (via the Analyze button), to reverse the direction of the track
(via the Reverse checkbox), to offset the track (the Offset Track checkbox), to specify
whether the destination object is four-corner pinned (the Type pop-up menu), and to
choose what transform is applied to the destination object (via the Adjust parameter).
Stabilize Controls
The Stabilize behavior uses a different method to analyze movement in a clip than the
Match Move and Analyze Motion behaviors. Generally, you do not use trackers to stabilize
a clip. The behavior’s sophisticated method of motion estimation tracks every pixel in
one frame to the subsequent frame. A motion vector is calculated based on this analysis.
The analysis can be performed on the entire clip, or on a track region. A track region is a
user-defined area of a clip that is analyzed.
If the result of the analysis requires additional correction, you can perform manual tracking
on noncontiguous time regions of the clip. For example, if an additional camera bump
affects frames 350 to 380, you can add a tracker to analyze that portion of the clip. The
data recorded from the analysis is added to the data recorded by the tracking to further
smooth the clip.
In addition to considering horizontal, vertical, or horizontal and vertical movement in the
clip, the Stabilize behavior also looks at position, scale, and rotation.
Note: The Stabilize behavior can only be applied to footage objects (a QuickTime movie
or an image sequence).
For information on using the Stabilize behavior, see Stabilize Workflow.
Note: When Smooth is chosen from the Method pop-up menu, additional parameters
become available in the HUD and Inspector.
1351Chapter 22 Motion Tracking