holographic 3d display
TRANSCRIPT
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DIGITAL HOLOGRAPHIC THREE DIMENSIONAL DISPLAYS
SEMINAR ON
BY KISHOR R S7 EC 08420013 CEMP
GUIDED BYMS.ASHA K(Asst.Prof.ECE)
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INTRODUCTIONBASICS OF 3D DISPLAYHOLOGRAPHIC TECHNIQUEDIGITAL HOLOGRAPHYDIGITAL HOLOGRAPHIC 3D DISPLAY OVERVIEWSETUP OF A DIGITAL HOLGRAPHIC 3D DISPLAYWORKING OF A SYSTEMADVANTAGES AND LIMITATIONSAPPLICATIONSCONCLUSIONREFERENCE
CONTENTS
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3D DISPLAYS GENERATING ‘GHOST’ LIKE DUPLICATIONS ARE FAMILIAR IN SCIENCE FICTION MOVIES.
IS IT REALLY POSSIBLE?
SEEING IS JUST OPTICAL
ILLUSION.FOR IT RECORD LIGHT FIELD DISTRIBUTION.
OPTICAL INFORMATION IS CARRIED BY WAVE FIELD.
INTRODUCTION
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SUCH WAVE FIELD CAN BE RECORDED BY HOLOGRAPHY
STILL HOLOGRAPHIC DISPLAY ALREADY EXIST
BUT DYNAMIC VIDEO HOLOGRAPHIC DISPLAYS ARE STILL IN RESEARCH
IT IS ONE OF LISTED TOPIC IN IBM’S NEXT 5 TECHNOLOGIES AFTER 2010
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3D DISPLAYSCONVENTIONAL 3D DISPLAYS ARE DEVICE WHICH
GIVE STERIOSCOPIC PERCEPTION OF 3D DEPTH.
LACK FREEDOM OF MOVEMENT
NOW THE WORD “3D” IS A MISNOMER,IT IS JUST STERIOSCOPIC
ONLY HOLOGRAPHIC DISPLAYS PROVIDE “TRUE 3D”
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STERIOSCOPIC
Two offset images are giving separately to two eyes. need glass to view
AUTOSTERIOSCOPIC
No need of glass.
HOLOGRAPHIC AND VOLUMETRIC
Generate the light volume
TYPES OF 3D DISPLAYS
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TECHNIQUE USED FOR NEXT GENERATION 3D DISPLAYS
TECHNIQUE THAT ALLOWS THE LIGHT SCATTERED FROM AN OBJECT TO BE RECORDED AND LATER RECONSTRUCTED .
THE IMAGE CHANGES AS THE POSITION AND ORIENTATION OF THE VIEWING SYSTEM CHANGES IN EXACTLY THE SAME WAY AS IF THE OBJECT WERE STILL PRESENT
THUS MAKING THE IMAGE APPEAR THREE-DIMENSIONAL
HOLOGRAPHY
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HOW HOLOGRAPHY WORKS
GENERATION RECONSTRUCTON
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TECHNOLOGY OF ACQUIRING HOLOGRAPHIC MEASUREMENT DATA.
THEN NUMERICAL RECONSTRUCTION OF OBJECT FROM RECORDED MEASUREMENT
IT GIVES 3 DIMENSIONAL SURFACE OR OPTICAL THICKNESS DATA
DIGITAL HOLOGRAPHY
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OVERVIEW OF DIGITAL HOLOGRAPHIC 3D DISPLAY
LIQUID CRYSTAL SPATIAL LIGHT MODULATORS (SLM) ARE PRIMARY CHOICE FOR THIS DISPLAY
SLM IS AN OBJECT THAT IMPOSES SOME FORM OF SPATIALLY-VARYING MODULATION ON A BEAM OF LIGHT
PROPERTIES OF SLM AREo Higher number of pixelso Smaller pixel periodo High efficiencyo Faster operation
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OVERVIEW OF DIGITAL HOLOGRAPHIC 3D DISPLAY
SLM’S ARE OF DIFFERENT TYPESo Complex amplitudeo Amplitude onlyo Phase onlyo Transmissiveo Reflectiveo PHASE ONLY ARE USED IN OUR SYSTEM
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REAL TIME COLOR HOLOGRAPHIC DISPLAY SETUP
COMPUTING FRINGE PATTERNS AND SENDING THEM THROUGH A DATA LINK TO THE DISPLAY IN REAL-TIME ARE SEVERE BOTTLENECKS
FOR ACCEPTABLE VIDEO RESOLUTIONS, HOLOGRAPHIC FRINGE PATTERNS MAY REACH UP TO SEVERAL MEGAPIXELS
ACCURATE COMPENSATED PHASE-ADDED STEREOGRAM (ACPAS) METHOD IS USED IN OUR SYSTEM TO GENERATE PHASE-ONLY HOLOGRAMS
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OUR 3D MODEL CONSISTS OF DISCRETE POINTS IN SPACE. 3D COORDINATE INFORMATION AND COLOR VALUE OF EACH POINT ARE EXTRACTED FROM EACH 3D VIDEO FRAME AND SEND THROUGH A NETWORK TO THE SERVER COMPUTER.
GPU CALCULATE PHASE ONLY HOLOGRAM’S IN REAL TIME IN RECEPTION IT IS FED TO SLM AND ILLUMINATED BY LED IN THREE COLORS
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ALGORITHM OF GENERATIONUSED MULTI GPU ARCHITECTURE
FOR EACH FRAME, RGB COLOR VALUES
AND THE CALCULATED 3D COORDINATE
INFORMATION ARE SENT ONLINE TO
SERVER THROUGH THE NETWORK
USING TCP/IP PROTOCOLTHE SERVER TAKES 3D COORDINATE AND
TEXTURE INFORMATION FROM THE CLIENT
FOR EACH FRAME.
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OVERALL SETUP
HOLOGRAMS GENERATRD AT CLIENTSENT ONLINE TO SERVEREACH COLOUR HOLOGRAM GENERATED ARE FED
TO SLM AND ILLUMINATED WITH LED
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SINGLE SLM STRUCTURE LIMITS VIEWING ANGLE
CANNOT ABLE TO ROTATE AROUND
IN THIS PROTOTYPE 6 CIRCULARLY ARRANGED SLM’S ARE USED
USING THIS WE GET TRUE 3D IMAGE WITH LARGE VIEWING ANGLE
A WORKING PROTOTYPE ARRANGEMENT
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1.ENLARGEMENT OF VIEWING ANGLESO WE NEED TO INCREASEPIXEL PERIOD Δp
FOR THIS INCREASE NUMBEROF SLM
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USING SINGLE SLM
USING MULTIPLE SLM
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2.ARRANGEMENT OF SLM
SIDE BY SIDEMODIFIED
• SIDE BY SIDE ARRANGEMENT CAUSE LARGE GAP
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3.SCHEMATIC OF SETUP
USING SIX SLM OF 1920X1080 PIXELS EACH
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3.RESULT OF SETUP
TOP VIEWFRONT VIEW
A GENERATED CUBE AT DIFFERENT ANGLES
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APPLICATIONSGEO-SEISMIC AND 3D VISUALIZATIONMEDICAL TRAININGMILITARY SIMULATION3D GAMINGIN 3D VIDEO CHAT 0R 3D PRESENCEIN CARTOGRAPHYIN HOLOGRAPHIC 3DTVIN ENTERTAINMENT FIELD
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LIMITATIONSEXPENSIVE
BULKY
DISPLAY NEED HIGH RESOLUTION HOLOGRAPHIC RECORDING AND RECONSTRUCTION
CURRENTLY AVAILABLE TECHNIQUES ARE LIMITED IN RESOLUTION
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FUTURE SCOPESTHIS TECHNOLOGY WILL DEVELOP THE FIELD OF
TELE PORTINGCAN VIEW CRICKET AND FOOTBALL MATCHES IN 360
ANGLEFEELS LIKE YOU WERE IN GALLERYINTERACTIVE TECHNIQUES LIKE SKINPUT GIVES A
NEW WORLD THROUGH THIS TEHNIQUE
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CONCLUSIONDigital holographic video displays are strong
candidates for rendering ghostlike “true 3-D” motion images
Reasonable sizes and resolutions seem to be sufficient for a stationary observer with no lateral or rotational motion
Gives you 360 real 3D
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REFERENCEDigital Holographic Three-Dimensional Video Displays Onural, L.;
Yaras , F.; Hoonjong Kang;Dept. of Electr. & Electron. Eng., Bilkent Univ., Ankara, Turkey, Proceedings of the IEEE April 2011
Circularly configured multi-slm holographic display system
Fahri Yaras, Hoonjong Kang, Levent Onural ,Bilkent University Department of Electrical and Electronics Engineering ,TR-06800 Ankara, Turkey [email protected], [email protected], [email protected]
www.ieee.orgwww.digital holography.eu
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ANY QUERIES???
THANK YOU ALL