The Visual Microphone: Recovering Sound from Silent Video
Abe Davis's Research · Demo · 5 min · 2014 · YouTube title: The Visual Microphone: Passive Recovery of Sound from Video
Why it's here
HN commenters cite it as the classic demonstration of audio recovery from video in surveillance and privacy discussions.
What it covers
MIT researchers show that sound can be recovered from silent video by analyzing tiny vibrations in objects such as a potato chip bag. It works even with consumer cameras by using rolling shutter.