This one is pretty amazing: a team of MIT researchers have created a
technique to amplify small changes in a video clip that enables us to
see minute changes that otherwise would’ve been unnoticeable (see 3:20
where they made a person’s arterial pulse visible). They called it Eulerian
Video Magnification:
Our goal is to reveal temporal variations in videos that are difficult
or impossible to see with the naked eye and display them in an indicative
manner. Our method, which we call Eulerian Video Magnification, takes
a standard video sequence as input, and applies spatial decomposition,
followed by temporal filtering to the frames. The resulting signal is
then amplified to reveal hidden information. Using our method, we are
able to visualize the flow of blood as it fills the face and also to
amplify and reveal small motions. Our technique can run in real time
to show phenomena occurring at temporal frequencies selected by the
user.
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Eulerian Video Magnification