Computer Vision Foundations · free preview
Spatiotemporal Filter Banks
Extending Gabor filters into space-time makes them selective to translation, but one tilted filter cannot pin down velocity, and summing quadrature energies along spectral planes builds units that can, an MT-like two-layer network.
1. Filters that watch time
Filters that watch time
2. One filter cannot name a speed
One filter cannot name a speed
3. Planes close the case
Planes close the case
4. Velocity as argmax, and the MT echo
Velocity as argmax, and the MT echo
5. Why tilt encodes velocity
A spatiotemporal Gabor's stripes are tilted in the x-t slab. Why does tilt correspond to velocity?
6. Why planes and not single filters
Why does one spatiotemporal Gabor fail to determine velocity, and how does the plane construction fix it?
7. Amplitude of a motion pair
A quadrature pair in the spatiotemporal bank returns h = -2 and q = 3. Write the amplitude a to one decimal place.
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