DIGITAL HOLOGRAPHIC THREE DIMENSIONAL DISPLAYS

SEMINAR ON

BY KISHOR R S7 EC 08420013 CEMP

GUIDED BYMS.ASHA K(Asst.Prof.ECE)

INTRODUCTIONBASICS OF 3D DISPLAYHOLOGRAPHIC TECHNIQUEDIGITAL HOLOGRAPHYDIGITAL HOLOGRAPHIC 3D DISPLAY OVERVIEWSETUP OF A DIGITAL HOLGRAPHIC 3D DISPLAYWORKING OF A SYSTEMADVANTAGES AND LIMITATIONSAPPLICATIONSCONCLUSIONREFERENCE

CONTENTS

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

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

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”

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

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

HOW HOLOGRAPHY WORKS

GENERATION RECONSTRUCTON

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

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

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

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

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

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.

OVERALL SETUP

HOLOGRAMS GENERATRD AT CLIENTSENT ONLINE TO SERVEREACH COLOUR HOLOGRAM GENERATED ARE FED

TO SLM AND ILLUMINATED WITH LED

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

1.ENLARGEMENT OF VIEWING ANGLESO WE NEED TO INCREASEPIXEL PERIOD Δp

FOR THIS INCREASE NUMBEROF SLM

USING SINGLE SLM

USING MULTIPLE SLM

2.ARRANGEMENT OF SLM

SIDE BY SIDEMODIFIED

• SIDE BY SIDE ARRANGEMENT CAUSE LARGE GAP

3.SCHEMATIC OF SETUP

USING SIX SLM OF 1920X1080 PIXELS EACH

3.RESULT OF SETUP

TOP VIEWFRONT VIEW

A GENERATED CUBE AT DIFFERENT ANGLES

APPLICATIONSGEO-SEISMIC AND 3D VISUALIZATIONMEDICAL TRAININGMILITARY SIMULATION3D GAMINGIN 3D VIDEO CHAT 0R 3D PRESENCEIN CARTOGRAPHYIN HOLOGRAPHIC 3DTVIN ENTERTAINMENT FIELD

LIMITATIONSEXPENSIVE

BULKY

DISPLAY NEED HIGH RESOLUTION HOLOGRAPHIC RECORDING AND RECONSTRUCTION

CURRENTLY AVAILABLE TECHNIQUES ARE LIMITED IN RESOLUTION

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

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

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 fahri@ee.bilkent.edu.tr, hjkang@ee.bilkent.edu.tr, onural@ee.bilkent.edu.tr

www.ieee.orgwww.digital holography.eu

ANY QUERIES???

THANK YOU ALL