Bob Lambermont - Petrobras Innovators in image processing

Bob Lambermont - Petrobras Principles of stereoscopic projection The active systemThe active system single CRT/DLPsingle CRT/DLP The passive systemsThe passive systems double CRT with passive filtersdouble CRT with passive filters double LCD/DLPdouble LCD/DLP single CRT with Z-screensingle CRT with Z-screen Stereoscopic projection technologies

Bob Lambermont - Petrobras Active stereoscopic projection The active system A CRT/DLP projector projects a ‘left-eye image’ and a ‘right-eye image’ one after 96Hz or 120 Hz (per eye : 48Hz or 60 Hz) The Active Shutter Glasses make sure that the appropriate eye sees the appropriate image Synchronisation signal From IG EMITTER Shutter signal to glasses CRT

Bob Lambermont - Petrobras Active stereoscopic projection Active Stereo Advantages and Drawbacks Excellent Stereo Quality Any type of screen is appropriate CRT: High resolution DLP: High brightness Expensive Active glasses Darkened room needed (CRT) Low resolution (DLP) PWM artifacts (DLP) Only possible with special 3-chip DLP projectors IR Emitter

Bob Lambermont - Petrobras Left image projector Right image projector Vertical polarizer Horizontal polarizer Non-depolarizing screen ! Horizontal analyzer Vertical analyzer Each projector displays image for 1 eyeEach projector displays image for 1 eye No need for fast phosphorNo need for fast phosphor For High resolution solutionsFor High resolution solutions Both projectors must be perfectly aligned and synchronized for true 3D imageBoth projectors must be perfectly aligned and synchronized for true 3D image Passive stereoscopic projection (2 CRT’s)

Bob Lambermont - Petrobras Extremely high light output, therefore ideally suited for 3D projection in high ambient light conditionsExtremely high light output, therefore ideally suited for 3D projection in high ambient light conditions Ideally for large audience performanceIdeally for large audience performance Flexible mounting due to extensive lens range.Flexible mounting due to extensive lens range. Projectors need to be perfectly alignedProjectors need to be perfectly aligned LCD most efficient solution thanks to polarized lightLCD most efficient solution thanks to polarized light Passive stereoscopic projection (2 LCD’s/DLP’s)

Bob Lambermont - Petrobras The Z-screen polarizes the light, synchronized with the left-right image being projected on the screen Need of a metallic / non-depolarizing screen Passive stereoscopic projection ( 1 CRT/DLP and Z-screen ) synchronized

Bob Lambermont - Petrobras Passive Glasses

Bob Lambermont - Petrobras Linear vs. circular polarization Passive stereo: linear and circular polarizationPassive stereo: linear and circular polarization Fairly standard,Fairly standard, Excellent separation if well aligned,Excellent separation if well aligned, Sensitive to head tiltSensitive to head tilt Requires adapted glassesRequires adapted glasses Good separationGood separation Independent of head tiltIndependent of head tilt

Bob Lambermont - Petrobras Passive Stereo Advantages and Drawbacks Cheap, comfortable passive glasses High brightness (LCD/DLP) LCD is very power-efficient solution Good Stereo Quality (dependent of polarizers and analyzers) Stereo Quality dependent of depolarisation ratio of the screen Tilting the head reduces 3D quality with linear polarizers Passive Stereoscopic projection

Bob Lambermont - Petrobras Active – pasive stereo conversion Motorized polarizers Active mode - polarizers up : dual light output! Passive mode – polarizers down Non-depolarizing screens are needed! Projectors need to be perfectly aligned

Bob Lambermont - Petrobras Generating 3D images Add an extra sync. SignalAdd an extra sync. Signal –Top-Bottom –Left-Right Interlaced (Odd-Even lines)Interlaced (Odd-Even lines) Double SourceDouble Source

Bob Lambermont - Petrobras Generating 3D images Image is split top - bottom:Image is split top - bottom: top is left imagetop is left image bottom is right imagebottom is right image double vertical frequencydouble vertical frequency

Bob Lambermont - Petrobras Generating 3D images Image is split left - right:Image is split left - right: left is left imageleft is left image right is right imageright is right image

Bob Lambermont - Petrobras Generating 3D images InterlacedInterlaced left image is odd lines, right image is even linesleft image is odd lines, right image is even lines half resolution, normal refresh ratehalf resolution, normal refresh rate

Bob Lambermont - Petrobras Generating 3D images 2 separate sources:2 separate sources: 2 synchronized DVD players, BETAcam tapes or Laser Discs2 synchronized DVD players, BETAcam tapes or Laser Discs Computer that generates 2 separate images, on 2 cards/connectorsComputer that generates 2 separate images, on 2 cards/connectors

Bob Lambermont - Petrobras Challenges of multi channel Why is CRT used so much?Why is CRT used so much? How can we use LCD in a multi channel environment?How can we use LCD in a multi channel environment? What about DMD?What about DMD?

Bob Lambermont - Petrobras Curved screen - BR Center

Bob Lambermont - Petrobras active stereo capability active stereo capability Optimal for multi channel & Curved Screens Optimal for multi channel & Curved Screens Flexible Real Time Geometry Correction Flexible Real Time Geometry Correction Real Time Soft Edging Real Time Soft Edging Intrinsic color matching Intrinsic color matching true black levels true black levels Double resolution (1440 x Double resolution (1440 x no image smear no image smear No Frame Delay No Frame Delay No pixels No pixels Why CRT technology in V&AR Display Systems?

Bob Lambermont - Petrobras What’s the Appeal of Light Valve? Plug it in and it worksPlug it in and it works Connects to any sourceConnects to any source Single lens (automatic focus)Single lens (automatic focus) Packages are getting smallerPackages are getting smaller portableportable Maintenance = replacing a light bulbMaintenance = replacing a light bulb ANYONE can use itANYONE can use it ? Cheaper?? Cheaper? Single screen presentations

Bob Lambermont - Petrobras CRT: new products BR 909 SP (& OEM) Same features as BR 909 PLUSSame features as BR 909 PLUS SP version: installation flexibilitySP version: installation flexibility OEM version: easy access for alignmentOEM version: easy access for alignment BR 912: ONLY 220V. BW specs comparable to 909,BW specs comparable to 909, Higher light output using 12” CRT tubesHigher light output using 12” CRT tubesGLOBAL: Auto-Image alignment system

Bob Lambermont - Petrobras Conclusion The mature CRT technology: typical active stereo and multi channel display qualities justify the compromise on brightness and stability of convergence.The mature CRT technology: typical active stereo and multi channel display qualities justify the compromise on brightness and stability of convergence. The Light valve technology: adaptation for multi channel displays is done on higher end products. passive and active stereo is possible. Choice will depend on the: application budget. Maintenance expectationThe Light valve technology: adaptation for multi channel displays is done on higher end products. passive and active stereo is possible. Choice will depend on the: application budget. Maintenance expectation

Bob Lambermont - Petrobras Thank you for your attention...

Innovators in image processing