stereo from shaky images

[gusl]

I was just looking at my summer pictures, reorganizing and deleting some.

I have a few nighttime pictures where, thanks to the long exposure, you can clearly see the shaking of my hands. For example, point lights appear as squiggly lines.

I noticed that nearby lights draw bigger squiggles than faraway lights.

My question is twofold:
* what are methods for digital stabilization *after* the picture is taken? in other words, what is the current technology on recovering the image behind a shaky picture?
* can we use such pictures for stereo, i.e. to make a 3D image?

Comments

[gwillen.livejournal.com]

There are methods for doing this in the presence of _linear_ movement, and with stuttering applied to the shutter so you don't get a smooth smear.

Based on that fact that this was recent research, I'm assuming there's not much in the presence of arbitrary shaking while the shutter is continuously open...

[gustavolacerda.livejournal.com]

<< There are methods for doing this >>

for doing which?

[bhudson.livejournal.com]

With several frames, it's truthy that you should be able to fully reconstruct the image: you can in the face of blurring, using superresolution, so why not in the face of jiitter, especially several instances of random jitter? With only one image, I'm not sure there's enough information unless you assume something about the scene, the jitter, or both. Such assumptions are pretty normal in vision research, but they make me slightly uncomfortable (although I admit that the human visual system also makes some rather strong assumptions).

I'm not sure how jitter could possibly help with stereo: you don't get any parallax from rotating around a fixed base, and the baseline change of hand jitter is tiny by definition.

[gustavolacerda.livejournal.com]

fortunately, pixels are even tinier!

Of course, I'm referring to translational jitter. Rotational jitter is useless here.

[bhudson.livejournal.com]

Say you have a megapixel camera with a 45-degree field of view. You jitter by a millimeter, then you register the two images perfectly. Congratulations, you now can determine the distance of objects up to 1.25 m away.

But actually you can't, because you blurred instead of having two perfectly registered images.

The maximum distance you can compute by triangulation if you can see an angle of theta is base/(2 tan(theta/2)). You need a really good camera to make the denominator small enough if your numerator is small.

[bhudson.livejournal.com]

On the other hand, if you have a 30-m scope or a Hubble, and you take images six months apart, you can do some pretty impressive stereo.

[claricebirnbac.livejournal.com]

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[rockypawlus.livejournal.com]

I am still puzzled as to the mechanism which limits the distance to which we can observe - on the one hand we have the pre-transparency opaque barrier and on the other hand we have Hubble's Law driving matter to a speed faster than that of light.

[stefanmurren.livejournal.com]

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