6B-L3:HIERARCHIAL LK
LK = Lucas Canade
Reduce the Resolution
Optical Flow: Aliasing
Imagine that our object is moving 7 pixels, estimating the motion is harder than moving 1 pixel. Hovewer, what if we reduce the resolution?
Multi Scale
Image Sub Sampling
If we use the below technique and if we zoom to the last picture and resize it, It might look like blurring effect but this is not we want it is just aliasing.
SOLUTION: Filter the image then subsample like below.
Image Pyramids
Computing The Laplacian Pyramid
Apples and Oranges (Blending)
Start with Something similar to Lucas-Kanade
Gradient constancy
region matching
energy minimization with smoothing term
keypoint matching (long-range)
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