Motion 5 - Motion Tracking Behaviors

• Match Move: This behavior is used to match a foreground element to a background

element so they appear locked together. This effect can be achieved in three ways:

• You can match a foreground element to a background element using one-point

(position), two-point (position, scale, or rotation), or four-point (corner-pinning)
tracking. Unlike other tracking behaviors, the Match Move behavior can perform the
analysis and compositing operations. You can add further modifications (blur, color
corrections, and so on) before you create the final composite.

• You can use the Match Move behavior to apply a reference a track recorded by

another tracking behavior. You do this by choosing a track from the Action pop-up
menu (the gear icon) in the Match Move behavior’s HUD or Inspector.

• You can apply the animation data of one object (animation created by behaviors or

keyframes, for example) to another object. You do this by dragging an animated
source object from the Layers list into the Source well in a destination object’s Match
Move behavior HUD or Inspector. In this way, you can apply the animated source
object’s movement to the destination object without analyzing the motion of the
source object.

Note: The Match Move behavior can be applied to nearly any object type.

• Stabilize: This behavior removes unwanted motion in a clip, such as camera jitter. The

stabilization can be applied to the horizontal or vertical movement in the clip, or to a
combination of horizontal and vertical movement. This effect can be achieved in any
of three ways:

• The Stabilize behavior can analyze and stabilize a clip without onscreen trackers. In

this case, the Stabilize behavior evaluates the entire frame of a clip using motion
analysis to record the movement of the camera. This behavior offers two ways to
use this recorded data: clip smoothing, which eliminates unwanted jitter while
maintaining the general motion of the camera; and clip locking, which stabilizes a
subject. This behavior can analyze and affect position, scale, and rotation.

• In addition to full-frame motion analysis, you can add onscreen trackers for one-point

(position) tracking or two-point (position, scaling, or rotation) tracking. When you
add manual trackers to the Stabilize behavior, Motion stabilizes the clip using data
from the trackers rather than from an automated motion analysis. When using this
method, the tracker moves the frame so the track point falls in the same spot in each
subsequent frame. You can also combine these methods; for example, you can track
part of a clip with the full-frame method and then switch to manually added trackers
later on.

• You can load analysis tracks recorded in one Stabilize behavior into another. To load

an analysis track, choose a track from the Action pop-up menu in the destination
object’s Stabilize behavior HUD or Inspector.

Note: The Stabilize behavior can only be applied to footage (a QuickTime movie or an
image sequence).

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Chapter 22

Motion Tracking