Computer Vision Foundations · free preview
Gabor Filter Banks
Covering the frequency plane with Gabor filters means choosing a tiling, rectangular or polar, and the polar layout of scaled rotated copies matches image spectra and gives the multiscale zebra reading.
1. One filter is one question
One filter is one question
2. Rectangular versus polar
Rectangular versus polar
3. What the bank holds at once
What the bank holds at once
4. The transform and its limits
The transform and its limits
5. Why sigma should grow with radius
In a polar Gabor bank, why do the blobs widen as the sampled frequency radius grows?
6. Reading the zebra bank
A polar Gabor bank's fine and coarse maps both respond to a zebra. What does each map show?
7. Counting a bank
A Gabor bank is built with 4 orientations at each of 3 scales. Write the total number of filters.
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