User Guide

CHAPTER 13
396
Using Property and Tracking Controls (PB only)
Defining tracking regions
Before tracking motion, define three tracking regions in the motion footage layer: a search
region, a feature region, and a track point. Resize each region by dragging a handle.
Make both regions as small as possible so that the Tracker/Stabilizer can more accurately
and quickly track the selected region. Increasing the size of either region increases the
time required for tracking.
A. Search region B. Feature region C. Track point
Search region Resize the box to define the area outside the feature region that the
Tracker/Stabilizer uses to locate the tracked object or region in the next frame. Large
feature movements between frames require a larger search region to accurately find and
match the feature from one frame to the next.The box must be large enough to contain the
largest possible movement of the feature region from one frame to the next. Although
increasing the search region increases tracking time, it’s better for the search region to be
too large than too small.
Feature region Resize the box to precisely define the element you want to track.
A
B
C
UG.book Page 396 Wednesday, February 21, 2001 12:05 PM