This seminar examines the new technology of Holographic Projections. It
highlights the importance and need of this technology and how it represents the new
wave in the future of technology and communications, the different application of the
technology, the fields of life it will dramatically affect including business, education,
telecommunication and healthcare. The paper also discusses the future of holographic
technology and how it will prevail in the coming years highlighting how it will also
affect and reshape many other fields of life, technologies and businesses.
Holography is a diffraction-based coherent imaging technique in which a
complex three-dimensional object can be reproduced from a flat, two-dimensional
screen with a complex transparency representing amp litude and phase values. It is
commonly agreed that real-time holography is the ne plus ultra art and science of
visualizing fast temporally changing 3-D scenes. The integration of the real-time or
electro-holographic principle into display technology is o ne of the most promising but
also challenging developments for the future consumer display and TV market. Only
holography allows the reconstruction of natural-looking 3-D scenes, and therefore
provides observers with a completely comfortable viewing experience. But to date
several challenges have prevented the technology from becoming commercialized. But
those obstacles are now starting to be overcome. Recently, we have developed a novel
approach to real-time display holography by combining an overlapping sub-hologram
technique with a tracked viewing-window technology.
2. Contents
2
What is Holography
•
Why Holography
•
Types of Holograms
•
How Holograms work
•
Recording of hologram
•
Reconstruction of hologram
•
Advances in technology
•
Applications & Future scope
•
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•
Conclusion
3. What is holography
3
Holography
is a technique that allows the light
scattered from an object to be recorded and later
reconstructed.
The
technique to optically store, retrieve, and process
information.
Preserve
subject
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the 3-D information of a holographed
6. Types of
Holograms
6
A. Reflex
hologram
Illuminated
by a spot of
white incandescent light
source, from front-above
The
image consists of light
reflected by the hologram
Produces
multicolour
holograms, makes images
optically indistinguishable
from the original objects
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7. 7
B. Transmission hologram
Viewed with laser light, usually
of the same type used to
make the recording
Need light source behind them
Virtual image can be very
sharp and deep
C.Computer-generated holograms
No need for a real object
Interference
pattern
is
calculated
digitally,
using
algorithms
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8. How
holograms
work
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8
The time-varying light field
of a scene with all its physical
properties is to be recorded
and then regenerated.
Hence the working of
holography is divided into
two phases:
•Recording
•Reconstruction
9. Recording
of hologram
9
Basic
tools required to
make
a
hologram
includes a red lasers,
lenses,
beam
splitter,
mirrors and holographic
film
Holograms
are recorded
in darker environment
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11. 11
• Laser : Red lasers, usually helium-neon (HeNe) lasers, are
common in holography. These are coherent light source.
• Beam splitter: This is a device that uses mirrors and prisms to
split laser beam of light into two beams.
Object beam (directed onto the object) and
Reference beam (travels directly onto the recording
medium)
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12. 12
• Mirrors: These direct the beams of light to the correct
locations
• Holographic film: Holographic film can record light at
a very high resolution, which is necessary for creating
a hologram. It's a layer of light-sensitive compounds
on a transparent surface, like photographic film.
Eg: Silver Halide Emulsion
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13. Process
13
When the two laser beams reach the recording
medium, their light waves intersect and interfere with
each other. It is this interference pattern that is
imprinted on the recording medium.
Hologram
Recondtruction
Hologram
Recording
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17. Capturing of
holographic
video
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17
By
replacing
the
conventional
holographic plate with
a digital camera and an
optoelectronic
2D
screen,
we
can
capture
and display
holographic video.
18. Projection of
holographic
video
18
Video hologram is coded
into light modulators
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These light modulators are
illuminated by coherent
light beam source, to
project video
20. Advances in
technology
20
Touchable
holograms
Tactile
holographic
with
haptic
display
feedback
Horizontal
360º view of a
image on table top
User
interfacing
integrated displays
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21. Applications
& Future scope
21
Educational applications
Marketing with 3D holographic
display
3D simulation displays
scientific visualization
Improved virtual Reality and
augmented reality
Telepresence
conferencing
Entertainment displays
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Military and Space Applications
and
for
video
22. 22
Intense
rooms
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Holographic checkpoint
for military, battlefield
simulations
In future all displays like
televisions, mobile phone
displays,
projector
displays will be replaced
by holographic displays
real
gaming
23.
24. Projected cost of Holographic
system
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24
25. Conclusion
25
Holographic
Technology
and Spectral Imagining has
endless applications, as far
as the human mind can
imagine
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In
future,
holographic
displays will be replacing
all present displays in all
sizes, from small phone
screen to large projectors
26. References
26
• “Holographic Projection Technology: The World is Changing.”;
Ahmed
Elmorshidy,
Ph.D
JOURNAL OF TELECOMMUNICATIONS, VOLUME 2, ISSUE 2, MAY 2010
• “Capture, processing, and display of real-world 3D objects using
digital holography”; Thomas J. Naughton; 2010 IEEE Invited Paper
• “Touchable
Holography”;
Takayuki
Hoshi;
The University of Tokyo; 2009
• “Holographic 3-D Displays - Electro-holography within the Grasp of
Commercialization”; Stephan Reichelt, Ralf Haussler, Norbert Leister,
Gerald Futterer, Hagen Stolle and Armin Schwerdtner (2010)
• “How Holograms Work.”; Wilson, Tracy V. 2010.“ HowStuffWorks, Inc.
Downloaded
November
05,
2010.
<http://science.howstuffworks.com/hologram.html>
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