4 ms·
It definitely has to be 2x the desired maximum frequency if you don't want aliasing. They probably capture higher frequencies by making assumptions about the in
by tomlu 12y ago
It definitely has to be 2x the desired maximum frequency if you don't want aliasing. They probably capture higher frequencies by making assumptions about the input signal, but this will inevitably lead to aliasing when these assumptions are violated. The article doesn't really go into depth about precisely how they go about this.
- cbr 12y agoThey have lots of pixels, though, which means you should be able to go higher than nyquist with some clever work. With two time samples you shouldn't be able to learn anything about the state of waves in a pool, but if each sample is a photograph with lots of pixels you can actually tell a lot.