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Glasgow scientists create single-pixel camera for 3D images
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May 17, 2013, 7:41:31 PM5/17/13
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Glasgow scientists create single-pixel camera for 3D images
A projector displays patterned light on the face on a
mannequin. These patterns are used to produce a 2D image.
A 3D image is then formed using a technique called "shape
from shade"
BBC News
May 16, 2013
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.
Continue reading the main story
"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.
More at:
http://www.bbc.co.uk/news/uk-scotland-22556172
Jai Maharaj, Jyotishi
Om Shanti
http://groups.google.com/group/alt.fan.jai-maharaj
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FAIR USE NOTICE: This article may contain copyrighted
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specifically authorized by the copyright owner. This
material is being made available in efforts to advance
the understanding of environmental, political, human
rights, economic, democratic, scientific, social, and
cultural, etc., issues. It is believed that this
constitutes a 'fair use' of any such copyrighted material
as provided for in section 107 of the US Copyright Law.
In accordance with Title 17 U.S.C. Section 107, the
material on this site is distributed without profit to
those who have expressed a prior interest in receiving
the included information for research, comment,
discussion and educational purposes by subscribing to
USENET newsgroups or visiting web sites. For more
information go to:
http://www.law.cornell.edu/uscode/17/107.shtml
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Since newsgroup posts are being removed by forgery by one
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A projector displays patterned light on the face on a
mannequin. These patterns are used to produce a 2D image.
A 3D image is then formed using a technique called "shape
from shade"
BBC News
May 16, 2013
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.
Continue reading the main story
"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.
More at:
http://www.bbc.co.uk/news/uk-scotland-22556172
Jai Maharaj, Jyotishi
Om Shanti
http://groups.google.com/group/alt.fan.jai-maharaj
o o o
o Not for commercial use. Solely to be fairly used
for the educational purposes of research and open
discussion. The contents of this post may not have been
authored by, and do not necessarily represent the opinion
of the poster. The contents are protected by copyright
law and the exemption for fair use of copyrighted works.
o If you send private e-mail to me, it will likely
not be read, considered or answered if it does not
contain your full legal name, current e-mail and postal
addresses, and live-voice telephone number.
o Posted for information and discussion. Views
expressed by others are not necessarily those of the
poster who may or may not have read the article.
FAIR USE NOTICE: This article may contain copyrighted
material the use of which may or may not have been
specifically authorized by the copyright owner. This
material is being made available in efforts to advance
the understanding of environmental, political, human
rights, economic, democratic, scientific, social, and
cultural, etc., issues. It is believed that this
constitutes a 'fair use' of any such copyrighted material
as provided for in section 107 of the US Copyright Law.
In accordance with Title 17 U.S.C. Section 107, the
material on this site is distributed without profit to
those who have expressed a prior interest in receiving
the included information for research, comment,
discussion and educational purposes by subscribing to
USENET newsgroups or visiting web sites. For more
information go to:
http://www.law.cornell.edu/uscode/17/107.shtml
If you wish to use copyrighted material from this article
for purposes of your own that go beyond 'fair use', you
must obtain permission from the copyright owner.
Since newsgroup posts are being removed by forgery by one
or more net terrorists, this post may be reposted several
times.
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