THE UNIVERSITY OF WESTERN AUSTRALIA
Last updated
Last updated
Optical Flow and Motion Field
Tracking
Applications
Optical Flow Constraints
Lucas Kanade Tracking Algorithm
Mean Shift Algorithms
Motion Field:
Projection of 3D relative velocity vectors onto the image plane.
Optic Flow:
Observed 2D displacement of pixels (brightness patterns) in the image.
Most of the time, motion field is what we want to find. But optic flow is what we actually measure from the image.
We can only measure the component of optic flow in the direction of intensity gradient.
We can not measure the component that is tangent to the intensity gradient.
Using optical flow, we can track pixels or corners over multiple frames
Sometimes we don't want to track every pixel or every corner
We mat want to track a specific object such as
A tennis ball
Pedestrians
Cars
Or simple blobs
