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The suggested reference points appear in the Canvas on the footage and in the magnified
inset as small red plus signs.
When you move a tracker toward a suggested point, the tracker snaps to the point.
The suggested points are not necessarily ideal tracking reference points for the feature
you want to track in the clip. Motion is merely picking locations in the current frame that
meet the track point criteria, such as an area of high contrast.
Giving Motion a Hint by Looking Ahead
When using the Analyze Motion behavior, you can direct a tracker where to look in a later
frame for its reference pattern. This tool is ideal for the following types of clips:
• A clip that contains fast-moving features
• A clip with subjects moving in a relatively straight vector (with or without obstructions)
• A clip with swish pans (but you might need to reset the “look-ahead” tracker at each
panning change)
Important: If your track fails and you reposition your tracker, you must also reset the
look-ahead tracker in the Canvas to provide a new motion vector from the new reference
point.
To define look-ahead frames
1 Apply an Analyze Motion behavior to a clip.
2 In the Canvas, position the tracker on a reference pattern.
1330 Chapter 22 Motion Tracking