quantum ghost imaging!

[Triple Zero]

http://www.globalsecurity.org/military/library/news/2009/11/mil-091102-afps05.htm

Ghost imaging is a technique that allows a high-resolution camera to produce an image of an object that the camera itself cannot see. It uses two sensors: one that looks at a light source and another that looks at the object. These sensors point in different directions. For example, the camera can face the sun and the light meter can face an object.

[Triple Zero]

via http://www.schneier.com/blog/archives/2009/11/quantum_ghost_i.html

two more detailed links

http://technology.newscientist.com/article/dn13825-quantum-camera-snaps-objects-it-cannot-see.html
http://arxiv1.library.cornell.edu/PS_cache/arxiv/pdf/0807/0807.2614v1.pdf

... turns out its not quantum

[Jasper]

So it's a way of basically seeing through smoke?

I had a hard time figuring out what it's applications are.

[Iason Ouabache]

So it's a way of basically seeing through smoke?

I had a hard time figuring out what it's applications are.

FTFA: The same method could one day be employed to produce satellite images of objects hidden behind clouds or smoke, using the sun's radiation as the photon source, says Shih. Doing that may require a photon counter beneath the clouds, but could allow a top-down view not possible using conventional methods.

[Cramulus]

so if I use this to look at girls, am I gonna see the good stuff? or just bones and guts?
           /

[Rumckle]

What's the difference?

Rumckle-
Only dates girls after seeing their x-rays.

[Elder Iptuous]

What's the difference?

Rumckle-
Only dates girls after seeing their x-rays.

you're a fan of that wierd type of hentai that features internal view imagery aren't you?

[Rumckle]

Why am I not surprised that exists? 

[Faust]

I'm missing the practicality of how this works.
The light source acts as a reference? As it varies the other image can be extracted? Is it not just an interferometer then?