User`s guide

Chapter 9 Motion Tracking
498
The Corner Pin Tracker and Motion Tracker filters share many common parameters, since
both filters employ motion trackers to produce effects. The main difference is that the
Motion Tracker uses motion data to affect a variety of shape and filter parameters in other
tracks in the timeline, while the Corner Pin Tracker has a more narrow focus. You can only
apply data created with the Corner Pin Tracker filter to the media in the Corner Pin Source
track.
Overview of Using the Corner Pin Tracker
The steps below provide an overview of the Corner Pin Tracker process. The sections that
follow provide detailed information on each step.
To use the Corner Pin Tracker filter:
1. Apply the Corner Pin Tracker filter directly to the timeline. You can apply the filter to a
shape track if you want, but the result is the same if the filter is a stand-alone track in the
timeline. Expand the Corner Pin Tracker filter track to reveal the nested tracks.
2. Import the media containing the moving area that you want to replace into the Motion
Tracker Source track.
3. Import the file containing the media you want to use to replace the moving area into the
Corner Pin Source track.
4. Click the Preview Monitor icon in the Corner Pin Tracker filter track to open a preview
window for the track. You can then use the onscreen controls, or controls in the Corner
Pin Tracker’s Search/Target tab in the Controls window, to place a motion tracker on
each of the four corners of the region to replace—see “Setting Target and Search
Regions” on page 499.
5. Generate the tracker data using the parameters in the Corner Pin Tracker’s Search/Target
and Advanced tabs in the Controls window. You can control how data from the various
trackers is averaged to produce the final data and otherwise fine-tune the process to
produce the desired track—see “Analyzing Motion” on page 496.
Also see “Search/Target Tab (Corner Pin Tracker)” on page 515 and “Advanced Tab
(Corner Pin Tracker)” on page 517.
6. The media in the Corner Pin Source track is automatically positioned in the region
defined by the four corner trackers. The media is distorted as necessary to fit the region
as it moves and changes shape. If necessary, you can manually correct any errors in the
generated data—see “Manually Correcting Errors” on page 497.