Kind of related: https://johncostella.com/magic/ and its discussion https://news.ycombinator.com/item?id=41756205

That was a very nice and detailed description of the Láczos filter. It gave some new perspectives that were not covered by the sources I've read earlier.

Not only a very nice explanation, but it's also presented in such an aesthetically pleasing way! The layout, the typography, the colors..

The blog is a thing of beauty.

Difference with Gabors kernels (that are in our visual cortex and what the first level CNN kernels look to converge to) is the scaling factor 1/t instead of e^(-t)