Wednesday, June 06, 2012

mildly mathematical: augmented reality, take one.

In the picture below, (a) indicates clipped images from a video, and (b) is the processed output, which can detect the blood flow of the subject's face!

cropped from the original image, as found here.

it makes sense that blood flow would cause small visual changes, but it would never occur to me to re-render reality to detect this!

as for where this image came from ..
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Eulerιan Videο Magnification for Revealing Subtle Changes in the World by Haο-Yu Wu, Michael Rubιnstein, Eugene Shιh, John Guπag, Frédο Durand, William T. Freemaη.

Our goal is to reveal tempοral 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 EuΙerιan Videο Magnificatiοn, takes a standard video sequence as input, and applies spatial decοmposition, followed by tempοral 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 blοοd 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 tempοral frequencies selected by the user.
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these kinds of advancements worry me too, of course:
imagine, for example, if someone implements a fast version of this EVM into an add-on for google glasses.

now suppose you believe a recent study, which claims that one can often detect liars by the flow of blood to the face.

voila: an instant lie detector ..!

i mean, i'm impressed by this kind of scientific advancement, but call me cynical; most of us probably lie a lot on a day-to-day basis, and this could very well be the undoing of our civilization.

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