Tracking Repositioned Shots

Flipping or Flopping a Shot			Animating Reposition Values
Chapter 10, Repositioning Images

Use the Point Tracker to stabilize a repositioned shot so that a selected point or shape in the source frame remains fixed in the same spot in the Player. You can use the Point Tracker in conjunction with reframing to stabilize jittery shots, or to automate the repositioning process. For example, if the original wide-screen shot contains a pan across a landscape, but you want to fix the view on a house (for television viewing), you track the house, and then assign the tracking data to the Reposition tool. This sets pan and scan values at each frame. The result is that the house remains in the same spot in the repositioned image.

Note: You can use exported stabilizer data from other Autodesk applications to stabilize your shots. See Loading Tracker and Stabilizer Data from Autodesk Applications.

This section is intended to provide an overview of the stabilizing process. See Animating Geometries with the Point Tracker.

Using the Point Tracker

You can use the Point Tracker to stabilize a repositioned shot.

To assign tracking information to the pan and scan settings of an image:

Make sure the aspect ratio value is set up as needed. See Setting the Aspect Ratio.
Select the shot to track.
Click Colour, and then click Secondaries to display the Secondaries menu.
Select the tracking feature by clicking Tracker.
Select the Point Tracker by clicking Point.

Enable a new tracker by clicking New.

Point button

Tracker button

New button

Click the tracking point in the image.
Click Image, and then click Reposition to display the Reposition menu.

A tracking box appears. You can adjust the box as needed to improve the track.

Click one of the Analyse buttons to begin the tracking process.

The system tracks the tracking point. After tracking is complete, you may need to make slight adjustments to the tracking data. See Animating Geometries with the Point Tracker.

Analyse backwards	Analyse ahead one frame
Analyse back one frame	Analyse forward

Enable either Racking or Reposition.
If you enabled Reposition, scale the image as needed.
Click Assign to apply the tracking data to the shot.

If you enabled Racking, the tracking point remains fixed vertically. If you enabled Reposition, the tracking point remains fixed both horizontally and vertically.

To turn off tracking data for a shot:

Select the shot that contains tracking data.
Click Image, and then click Reposition to display the Reposition menu.
Click Unassign.