2017

Table Of Contents
4 Using the Select tool from the Stabilizer Tools menu, drag the reference box and position it on the new
reference point.
5 Go to the first frame of the sequence and click Analyze.
Finding the Best Tolerance Value
The Tolerance value determines how much discrimination the Stabilizer uses in matching the reference
point from frame to frame and in setting a keyframe for that frame. At 100% tolerance (no discrimination),
almost anything is considered as a match and a keyframe is set. At 0% tolerance (complete discrimination),
only a perfect match is accepted.
If the reference point becomes hidden by another object, you can use the Tolerance value to make the tracker
ignore the reference point in parts of the clip where it is hidden, then continue tracking it normally when
it reappears. Choosing a good Tolerance value reduces the need to manually reposition the tracker box
during analysis.
TIP You can also adjust the tolerance to make a valid keyframe that has been filtered out reappear.
To find the best Tolerance value:
1 Click Setup and then enable Path to view the tracking path.
2 Analyze the clip with full (100%) tolerance.
3 Go to the first frame where the reference point is hidden by another object and adjust the tolerance
value until the crosshair reappears in the tracker box.
The crosshair reappears when there is a keyframe.
4 Go to the first frame in the sequence and click Analyze.
Once you determine the optimal tolerance value, further analysis automatically discards the unwanted
keyframes, and the position of the reference point is extrapolated until the reference point reappears.
Analyzing Backward
Analyze the clip backwards when the pattern you want to track grows larger or when it is off screen at the
beginning of the clip.
To analyze backward:
1 Select Backward from the Direction box.
2 Go to the last frame of the sequence.
738 | Chapter 17 Stabilizing and Tracking