3D Holographic

Projection Technology

GUIDED BY,

SAFUVAN T

ASST.PROFESSOR

DEPT.OF ECE

YCET

SUBMITTED BY,

SHAHID S

ROLLNO: 12416055

YCET

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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

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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

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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

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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

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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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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

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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

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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)

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• 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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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

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Reconstructio

n of hologram

The photographic plate is

illuminated with original

light source used for

recording holograms.

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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.

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Projection of

holographic

video Video hologram is

coded into light

modulators

These light modulators

are illuminated by

coherent light beam

source, to project video

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Advances in

technology Touchable holograms

Tactile holographic

display with haptic

feedback

Horizontal 360º view

of a image on table

top

User interfacing

integrated displays

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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

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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

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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

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• “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

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