I can’t remember exactly how I ended up at the Lost Clock Emporium. I do remember brushing by disturbed looking people making their way out.
“Clock a load of you!”, the proprietor muttered, before looking up. “No time to waste, I have things to show you.”
If you’re working with image processing and discrete Fourier transforms (frequency analysis/filtering)1 you need test images, and possibly even videos.
Xor Xor Gabor2 is my name for an easy to make test image (and video) that is a nutritious source of frequencies:
$$ i = x \oplus y \tag{\(0 <= x,y < 2^L\)} $$More on Ohmaps: component failure battles, limitations, ambiguity…
Disclaimer: I am not an electrician. Nothing here is electrical advice/expertise. Insure your garments.