Single pixel can create 3D image

[hab...@anony.net]

bbc.co.uk
Scientists in Glasgow have discovered a low-cost way to create 3D
images.

Their system uses detectors which have a single pixel to sense light
instead of the millions of pixels used in the imaging sensors of
digital cameras.

The detectors can "see" frequencies beyond visible light, which
researchers say could open up new uses for 3D imaging in medicine and
geography.

They said the single-pixel detectors cost "a few pounds" compared to
current systems, which cost "thousands".

It is hoped that the system's ability to senses wavelengths far beyond
the capability of digital cameras and its low cost, could make it a
valuable tool for a wide range of industries.

Researchers said possible uses could range from locating oil to
helping doctors find tumours.

Crossword patterns
Prof Miles Padgett led the team at University of Glasgow's School of
Physics and Astronomy, which developed the technique.

He said: "Single-pixel detectors in four different locations are used
to detect light from a data projector, which illuminates objects with
a rapidly-shifting sequence of black-and-white patterns similar to
crossword puzzles.

"When more of the white squares of these patterns overlap with the
object, the intensity of the light reflected back to the detectors is
higher.

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Digital camera sensors have a very limited sensitivity beyond the
spectrum of visible light, whereas a single-pixel detector can easily
be made to capture information far beyond the visible�

Baoqing Sun
University of Glasgow
"A series of projected patterns and the reflected intensities are used
in a computer algorithm to produce a 2D image."

He said a 3D image was then created by combining images from the four
detectors using a well-known technique called "shape from shade".

This 3D computational imaging, or ghost imaging produces detailed
images of objects in just a few seconds.

Conventional 3D imaging systems uses multiple digital camera sensors
to produce a 3D image from 2D information.

Careful calibration is required to ensure the multi-megapixel images
align correctly.

Beyond the visible
Prof Padgett said: "Our single-pixel system creates images with a
similar degree of accuracy without the need for such detailed
calibration."

Lead author on the paper Baoqing Sun said: "It might seem a bit
counter-intuitive to think that more information can be captured from
a detector which uses just a single pixel rather than the
multi-megapixel detectors found in conventional digital cameras.

"However, digital camera sensors have a very limited sensitivity
beyond the spectrum of visible light, whereas a single-pixel detector
can easily be made to capture information far beyond the visible,
reaching wavelengths from X-ray to TeraHertz."

The team's paper, 3D Computational Imaging with Single-Pixel
Detectors, is published in the journal, Science

[benj]

On Fri, 17 May 2013 23:39:01 +0000, habshi wrote:

> bbc.co.uk
> Scientists in Glasgow have discovered a low-cost way to create 3D
> images.
>
> Their system uses detectors which have a single pixel to sense light
> instead of the millions of pixels used in the imaging sensors of digital
> cameras.
>

> He said: "Single-pixel detectors in four different locations are used to
> detect light from a data projector, which illuminates objects with a
> rapidly-shifting sequence of black-and-white patterns similar to
> crossword puzzles.

Gosh Glasgow scientists who have published more than 260 papers now
invent the low cost scanner! It's hard to believe but my paper scanner
actually only uses a single pixel (to completely bastardize the meaning
of the word) and only cost $20. And it produces amazing color images that
normally would take my mega-pixel Nikon camera that cost thousands of
dollars.

Of course the Glasgow device actually uses four detectors (Oh, let's call
them "single pixels" shall we?) not one, but what the hell. And of course
it's not a camera but a scanner. But journalists don't give a shit. The
important thing is that Scotland is not about to let MIT that recently
"invented" Faraday induction get ahead of them. So they invented the
digital scanner. Good for them!

Habshi you are still an idiot.

[1treePetrifiedForestLane]

hm; four pixels, placed in what configuration?