User`s guide

Working with the Motion Stabilizer
513
Target Update Criteria
menu
Determines how often the motion of the target is
estimated. The choices include:
Always Update. Estimates the motion between two
adjacent frames in time.
No Update. Estimates between the frame at the
keyframe and the current frame. If your target object
does not change through the course of the video, use
the No Update or Auto Update option.
Auto Update. Estimates once with the target from
the previous keyframe. If the estimation fails, the
estimation is re-calculated with an updated target. If
the tracker fails again, the tracker projects the
previous estimate or assumes no motion, depending
on the Failure Mode and Failure Threshold.
Threshold Is only visible in Auto Update Mode and determines
the quality at which the tracker reverts to another
update method. The quality is determined by
measuring the similarity between the target image
and the best match in the search region.
• If the quality using No Update falls below 50
percent, the tracker tries again using the Update
mode.
• If Threshold is set to 100, the filter always uses
the No Update mode.
Failure Mode menu After trying both No Update and Update modes, the
quality is still below the Threshold value, the tracker
uses the parameter settings. The options include:
Continue. Projects the data from the previous
frame. This preserves the object's inertia.
Wait. Assumes no motion, forcing you to set a new
keyframe to continue the analysis. Use for an object
that moves off screen and returns. The tracker waits
until the object returns and detects the object.
Ignore. Does not use the Failure Threshold setting,
so the tracking data is returned regardless of quality.
Parameter Description