6.0

Generating Tracking Data
330
Generating Tracking Data
You can generate tracking data for any number of the available trackers in a single operation.
You can generate tracking data for the entire length of the segment, or for any part of the segment
starting from the location of the position indicator. This lets you stop tracking at any point in the
segment and resume later, or retrack over any part of the segment whenever you need to do so.
You can also create separate tracking regions for different parts of your segment, and define a
different target area for each region. This is primarily useful for performing offset tracking. Once
you create a region, you can move the position indicator to the start of that region and generate
tracking data for the region. For more information, see “Offset Tracking” on page 332.
As your Avid editing application generates tracking data, it updates the tracker timeline displays
to show the status of tracking data over time. For more information on the tracker timeline
display, see “Understanding Tracking Data” on page 334.
FluidTracker If you need to search a large part of your image, FluidTracker might produce good
tracking data faster than the Correlation Tracker.
In the following two specific situations, FluidTracker usually produces more accurate
data than the Correlation Tracker:
• When the points you want to track start outside the visible area of the frame.
• When you are using four trackers to control the corner-pinning of an image.
This tracking engine uses the same motion analysis methods that FluidMotion Timewarp
uses.
FluidStabilizer This tracking engine is designed to track camera motion and is recommended for use
with the Stabilize effect. It is often particularly effective for removing camera motion
when used in combination with the SteadyGlide feature. For more information on
SteadyGlide, see “Understanding the SteadyGlide and Smoothing Options for Tracking”
on page 337.
FluidStabilizer divides the image into a grid, automatically selects a point of interest in
each grid area, and then tracks each point using the same motion analysis methods that
FluidMotion Timewarp uses. These points appear as highlighted green pixels in the
image display.
FluidStabilizer then uses further calculations to combine the motion of these points,
de-emphasizing any values that are not consistent with the general pattern of motion.
The result is a series of data points (displayed with the standard tracking data cross and
dots) that, for many images, accurately represents the motion of the camera and is not
distorted by other motion or noise in the image.
Tracking Engine Description