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
•How to find these
features?
–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
–windows where has two large
eigenvalues
•Called the Harris Corner Detector