3d holographic projection ppt
TRANSCRIPT
3D Holographic
Projection Technology
GUIDED BY,
SAFUVAN T
ASST.PROFESSOR
DEPT.OF ECE
YCET
SUBMITTED BY,
SHAHID S
ROLLNO: 12416055
YCET
1
Contents • What is Holography
• Why Holography
• Types of Holograms
• How Holograms work
• Recording of hologram
• Reconstruction of hologram
• Advances in technology
• Applications & Future scope
• Conclusion
2
What is holography
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 the 3-D information of a holographed subject
3
Why
holographic
display A high resolution three
dimensional recording of an
object
Glasses free 3D display
No need for projection
screen
Life like images
Interactive display
4
Timeline of holography5
Types of
HologramsA. 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
6
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
7
How
holograms
work 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
8
Recording
of hologram Basic tools required to
make a hologram
includes a red lasers,
lenses, beam splitter,
mirrors and holographic
film
Holograms are
recorded in darker
environment
9
Recording a hologram 10
• 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)
11
• 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
12
Process
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
Recording
Hologram
Recondtruction
13
Reconstructio
n of hologram
The photographic plate is
illuminated with original
light source used for
recording holograms.
14
Reconstructing a hologram15
Capturing of
holographic
video By replacing the
conventional holographic
plate with a digital
camera and an
optoelectronic 2D
screen, we can capture
and display holographic
video.
16
Projection of
holographic
video Video hologram is
coded into light
modulators
These light modulators
are illuminated by
coherent light beam
source, to project video
17
Advances in
technology Touchable holograms
Tactile holographic
display with haptic
feedback
Horizontal 360º view
of a image on table
top
User interfacing
integrated displays
18
Applications
& Future
scope
Educational applications
Marketing with 3D
holographic display
3D simulation displays for
scientific visualization
Improved virtual Reality and
augmented reality
Telepresence and video
conferencing
Entertainment displays
Military and Space
Applications
19
Holographic checkpoint
for military, battlefield
simulations
Intense real gaming
rooms
In future all displays like
televisions, mobile
phone displays,
projector displays will be
replaced by holographic
displays
20
Conclusion Holographic Technology
and Spectral Imagining
has endless applications,
as far as the human mind
can imagine
In future, holographic
displays will be replacing
all present displays in all
sizes, from small phone
screen to large projectors
21
• “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)
References 22
Thank
you
23