3D Holographic Projection Technology

3D Holographic Projection Technology1CONTENTS

2What is HolographyWhy HolographyTypes of HologramsHow Holograms workRecording of hologramReconstruction of hologramAdvances in technologyApplications & Future scopeConclusion

2What is HolographyHolographyis a technique that allows thelight 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

3Why Holographic Display?A high resolution three dimensional recording of an objectGlasses free 3D displayNo need for projection screenLife like imagesInteractive display

44Timeline of Holography

5Types of HologramsReflex hologramIlluminated by a spot of white incandescent light source, from front-aboveThe image consists of light reflected by the hologramProduces multicolour holograms, makes images optically indistinguishable from the original objects

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Transmission hologramViewed with laser light, usually of the same type used to make the recordingNeed light source behind themVirtual image can be very sharp and deepComputer-generated hologramsNo need for a real objectInterference pattern is calculated digitally, using algorithms.7How 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:RecordingReconstruction

8Recording of Hologram

Basic tools required to make a hologram includes a red lasers, lenses, beam splitter, mirrors and holographic filmHolograms are recorded in darker environment

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Recording a Hologram10Laser : 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) andReference beam (travels directly onto the recording medium)11Mirrors: These direct the beams of light to the correct locationsHolographic 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. Example: Silver Halide Emulsion12ProcessWhen the two laser beams reach the recording medium, their light waves intersect andinterferewith each other. It is this interference pattern that is imprinted on the recording medium.

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HologramRecordingHologramReconstruction

14Reconstruction of Hologram

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

15Reconstructing a Hologram

16Capturing of Holographic videoBy 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 videoVideo hologram is coded into light modulators These light modulators are illuminated by coherent light beam source, to project video

18Projection of Multicolour Holographic video

19Advances in Technology

Touchable hologramsTactile holographic display with haptic feedbackHorizontal 360 view of a image on table topUser interfacing integrated displays

20Applications & Future scopeEducational applicationsMarketing with 3D holographic display3D simulation displays for scientific visualizationImproved virtual Reality and augmented realityTelepresence and video conferencingEntertainment displaysMilitary and Space Applications

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Holographic checkpoint for military, battlefield simulationsIntense real gaming roomsIn future all displays like televisions, mobile phone displays, projector displays will be replaced by holographic displays22Projected cost of Holographic system

23Conclusion

Holographic Technology and Spectral Imagining has endless applications, as far as the human mind can imagineIn future, holographic displays will be replacing all present displays in all sizes, from small phone screen to large projectors.24Holographic Projection Technology: The World is Changing- Ahmed Elmorshidy, Ph.D, JOURNAL OF TELECOMMUNICATIONS, VOLUME 2, ISSUE 2, MAY 2010Capture, 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, 2009Holographic 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. References25Thank you26