alt Hacker NewsIt also can actually allow you to identify positions within the image at a greater resolution than the pixels, or even light itself, would otherwise allow.
In microscopy, this is called 'super-resolution'. You can take many images over and over, and while the light itself is 100s of nanometers large, you actually can calculate the centroid of whatever is producing that light with greater resolution than the size of the light itself.
Are the 100s of nanometers of light larger than the perturbations of Brownian motion?
This oldish link would indicate inclusions of lead in aluminum at 330°C will move within 2nm in 1/3s but may displace by 100s of nanometers over time:
https://www2.lbl.gov/Science-Articles/Archive/MSD-Brownian-m...