Eulerian Video Magnification for Revealing Subtle Changes in the World

Re:Eulerian Video Magnification for Revealing Subtle Changes... by JacobIrwin on Monday June 04, 2012 @07:00AM (#4063417)

If anybody could help clarify a concept (a specific filtering method), from video:

"we filter the sequence temporally using a "???" ...and boost the temporal signal to generate a video..." (at 2min. 45sec in video)

What type of filter is being described (missing from quotes; "???") ? Bonus upvotes for providing a URL to definition (detailed description of the missing term).

[ Parent | on HN ]

Re:Eulerian Video Magnification for Revealing Subtle Changes... by noisebeuter on Monday June 04, 2012 @09:09AM (#4063790)

He talks about a "Temporal Bandpass Filter". Not sure about the "temporal" part, but in DSP a bandpass filter is a filter (think Audio-EQ) that passes frequencies within a specific range and rejects the rest. See https://en.wikipedia.org/wiki/Bandpass_filter

[ Parent | on HN ]

Re:Eulerian Video Magnification for Revealing Subtle Changes... by JacobIrwin on Monday June 04, 2012 @06:07PM (#4066202)

Thanks much noisebeuter!

[ Parent | on HN ]

Re:Eulerian Video Magnification for Revealing Subtle Changes... by 0x09 on Monday June 04, 2012 @10:39AM (#4064172)

It would seem to me from perusing the spec that they are simply taking a video, doing a 1D DCT on the time axis and amplifying a "frame" in the result corresponding to the desired period. Hopefully someone can correct me if there's more to it.

I'd like to get at one of their sample videos before filtering because it would be pretty easy to toss together a workalike based on the above.

[ Parent | on HN ]