3D Holographic Projection Technology

GUIDED BY,SAFUVAN T

ASST.PROFESSORDEPT.OF ECEYCET

SUBMITTED BY,SHAHID SROLLNO:

12416055YCET

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2Contents • What is Holography

• Why Holography• Types of Holograms• How Holograms work• Recording of hologram• Reconstruction of

hologram• Advances in

technology• Applications & Future

scope• Conclusion

3What 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

4Why 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

5Timeline of holography

6Types of Holograms

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

7B.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

8How 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

9Recording 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

10Recording a

hologram

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• 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

13Process

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.

HologramRecording

HologramRecondtruction

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Reconstruction of hologram

The photographic plate is illuminated with original light source used for recording holograms.

15Reconstructing a hologram

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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

21Conclusio

n 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.DJOURNAL 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

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Thank you