Motion tracking
Suppose we have more than two images
•How
to track a point through all of the images?
Feature Tracking
•Choose only the points
(“features”) that are easily tracked
•This should sound familiar…
–In principle, we could
estimate motion between each pair of consecutive
frames
–Given point in first frame,
follow arrows to trace out it’s path
–Problem: DRIFT
»small errors will tend to
grow and grow over time—the point will drift way off course