2011

Control points of an object The shape of the object changes to reflect the
motion of the reference feature its control points are locked to. For example,
if you want to replace the label on an actor's clothing, each corner on the new
label would track a corner on the old label. The shape of the new label would
change to correspond to those movements.
Stabilizing Concepts
Stabilizing is a powerful process that represents one of the most common uses
of the Tracker.
In most tracking the Tracker applies the reference motion to the desired
element so that the two are locked. In stabilizing, the Stabilize filter uses the
Tracker data to invert the analyzed motion to correct unwanted camera or
subject motion.
You can stabilize any number of features in a composition:
1-point stabilizing The positional (location in X and Y) motion you want
to eliminate is vertical, horizontal, or both vertical and horizontal.
2-point stabilizing The motion you want to remove involves
scaling/rotation. It may also involve vertical/horizontal shifts.
With stabilizing, the shift values are inverted, for example, (3, -2) would
become (-3, 2) before they are applied. This inversion results in an elimination
of the motion.
The Stabilize filter uses the Tracker data to move the image so that the reference
feature occupies the same position it did in the preceding frame. In other
words, the reference feature stays still because the frame is being moved.
4-point stabilizing By adding two extra Tracker Analyzers you can perform
4-point stabilization and eliminate translation, rotation, scale, and pivot
motion.
Tracker UI
The Tracker UI contains the following parameters:
Stabilizing Concepts | 755