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Seminar Series: Stereo Systems: Overview adapted from: “Stereo & 3D Display Technologies” Prof. David McAllister -

Virtual Environments – VIVE007/4C76 - Dr. A. Steed. Seminar Series: Stereo Systems: Overview adapted from: “Stereo & 3D Display Technologies” Prof. David McAllister - Date: Wednesday 19 th October 2005 Presenters: Erica Calogero, Alastair Moore, Mojtaba Bahrami.

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Seminar Series: Stereo Systems: Overview adapted from: “Stereo & 3D Display Technologies” Prof. David McAllister -

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  1. Virtual Environments – VIVE007/4C76 - Dr. A. Steed Seminar Series: Stereo Systems: Overview adapted from: “Stereo & 3D Display Technologies” Prof. David McAllister - Date: Wednesday 19th October 2005 Presenters: Erica Calogero, Alastair Moore, Mojtaba Bahrami

  2. Stereo & 3D Display Technologies Introduction • Introduction • 1.1 Depth Cues • 1.2 A Technology Taxonomy • 1.3 Stereo Pairs • 2. Display Technology Overview • 2.1 Separating Left and Right Eye Views • 2.2 Cross Talk • 2.3 Field Sequential Techniques • 2.4 Time-Parallel Techniques Erica Calogero

  3. Stereo & 3D Display Technologies Introduction A Technology Taxonomy 1.1. A Technology Taxonomy Terminology – Stereo window/ stereo plane Interocular distance Homologous Vertical disparity/ parallax (always = 0) Wall-eyed Pseudo stereo Convergence Accomodation

  4. Stereo & 3D Display Technologies Introduction Stereo Pairs 1.2. Stereo Pairs • 3D displays fit into one of 3 categories: • Stereo pair – fixed accomodation, virtual • Holographic - dynamic accomodation, virtual • Volumetric/ Multiplanar – dynamic accomodation, solid • Stereo Pair Technologies: • Distribute L & R views of a scene to the viewer • Special viewing devices are often needed to direct • the appropriate view to the correct eye • If no special device is needed, then the technology is called • autostereoscopic. i.e. hard copy devices.

  5. Stereo & 3D Display Technologies Display Technologies Overview 2. Display Technologies Overview • Separating Left & Right Eye Views • Cross Talk • Ghosting/ blurring that occurs when both eyes • can see the images intended for the other eye. • Field Sequential Techniques – • One image is presented to the left eye while the • right eye is block and vice versa. e.g. the CAVE. • Time Parallel Techniques – • Both images are presented at the same time and • eye is directed to the correct image by different • means. e.g. HMDs, View Master, red & green glasses.

  6. Stereo & 3D Display Technologies 3D Devices • 3. 3D Devices: Viewing Devices Required • ( Hardcopy ) • Field Sequential Devices • Pulfrich Technique • FakeSpace PUSH Display • Work Bench Displays • VREX Micropolarizers

  7. Stereo & 3D Display Technologies 3D Devices Field-Sequential Devices Field-Sequential / Time multiplexed Methods • Active Glasses – eg.CrystalEyes system • Advantages: high dynamic range >1000:1 • no ghosting/double image <32% • Disadvantages: high frame rate required • power supply • synchronisation • fragil

  8. Stereo & 3D Display Technologies 3D Devices Active Glasses http://astronomy.swin.edu.au

  9. Stereo & 3D Display Technologies 3D Devices Passive Glasses • Passive Glasses – eg.ZScreen system • Advantages: refresh rate < active glasses • cost per. user • no power supply • no synchronization • Disadvantages: lower dynamic range • transmission • may suffer ghosting • image cross talk

  10. Stereo & 3D Display Technologies 3D Devices

  11. Stereo & 3D Display Technologies 3D Devices The Pulfrich Technique • Passive Glasses – neutral density filter • German physicist Carl Pulfrich (1858-1927) • perception in the covered eye is delayed by optical filter • direct image and the delayed image will form a stereo pair • Disadvantages: requires constant motion • illusion motion dependent • does not replicate human stereo

  12. Stereo & 3D Display Technologies 3D Devices FAKESPACE Push Display Fakespace Dstation Fakespace PUSH Fakespace Systems Inc. M1 Desk

  13. Stereo & 3D Display Technologies 3D Devices Time Parallel / glasses/no glasses µPol Technology Parallax Barrier

  14. 3.5 Time Parallel/ ~Large Format Displays

  15. Stereo & 3D Display Technologies LargeFormatDisplays • Why Large Format Displays? • To overcome the limited field of view and low resolution of HMDs. • Allowing the user to move in space (requires position tracking) • Experiencing highly immersive display environments • Moving towards the commercial side IMAX Cinema; Source: http://www.imax.ac • How? • Projection systems have been developed that use large projection surfaces to simulate immersion. • Example of large Format Displays: • IMAX • Fakespace Systems Displays • VisionDome Immersive Room Source: http://www.fakespacesystems.com

  16. Stereo & 3D Display Technologies LargeFormatDisplays IMAX IMAX • IMAX (Image MAXimum) • Uses the standard filed-sequential polarized projection mechanism to project stereo images onto a huge screen that encompasses the viewer's peripheral vision. • Users wear passive glasses. These glasses use matching polarization filters in front of the projector lenses and the eyes. • The viewing distances are large. In this viewing context, both accommodation and binocular parallax are almost entirely lost. Source: www.imax.ac Create the illusion that you are really 'in the picture' and not just watching it IMAX 3D Camera http://www.sciencemuseum.org.uk/imax/

  17. Stereo & 3D Display Technologies LargeFormatDisplays Fakespace Systems Display -- Fakespace System is the major provider of Immersive Rooms (i.e. CAVE™) -- Cave™ is the Most Widely Installed Fully Immersive Visualization System in the World. -- Concept behind the CAVE™ also known as walk-through/fly-through: A complex, 3D model of a building, structure, or other physical space through which you can move your viewpoint as if walking or flying through it. -- To produce a walk-through: create a scene for every possible point of view and field of view, then display the scene based on the participant's input. CAVE: “CAVE Automatic Virtual Environment” • Typically shutter technology is used to present alternate left/right eye frames to the viewer, hence is immersed in a completely surrounding VE. • Single participant + Several people can be situated in the CAVE at the same time, though the display is completely correct for one participant • Could be Multi-participant! HOW? Source: http://www.fakespacesystems.com

  18. Stereo & 3D Display Technologies LargeFormatDisplays Fakespace Systems Display How CAVE™ is constructed and How it works: These pictures are an artistic representation of the layout of the CAVE™, showing all the different components that make up the whole system. The Display System Projectors Projection Wall(Ideally a CAVE™ is a room that has all six walls as projection screens, on which a virtual environment (VE) is projected) Mirrors Shutter Glasses(A participant wears lightweight stereo glasses with a head-tracking device mounted) The Tracking System Head Tracking and Wand User can interact with the image/environment using various input devices. Possible drawbacks to CAVE™? Source: http://www.cave.rdg.ac.uk/

  19. Stereo & 3D Display Technologies LargeFormatDisplays Fakespace Systems Display • FLEX™ and reFLEX™ • These new systems designed by Fakespace: • allow a for single-person configuring, • fully detached module capabilities! The FLEX™ is the world's first commercial re-configurable visualization solution for those whose viewing, collaboration, and presentation requirements cannot be met within the confines of a single visualization technology. Source: http://www.fakespacesystems.com -- Fact: The fact that VE sites represent both academic and commercial interests suggests that VR is extending beyond research labs and science fiction into the real world.

  20. Stereo & 3D Display Technologies LargeFormatDisplays The VisionDome VisionDome is an immersive digital environment that, via proprietary projection and rendering technologies creates 3D display. • The VisionDome delivers • a full-color, raster based, • interactive display, • with 360 degree projection and • a 180 degree field of view. -- The tilted hemispherical screen is positioned so as to fill the field-of-view of the participants, creating a sense of immersion in the same way that large-screen cinemas draw the audience into the scene. -- The dome itself allows freedom of head motion, so that the observer can change their direction of view, and yet still have their vision fully encompassed by the image. Source: http://www.elumens.com

  21. Stereo & 3D Display Technologies LargeFormatDisplays The VisionDome Elumens offers a family of VisionDome models for audience sizes from 1 to 45 people. VisionDome VS. IMAX! In contrast with the large format, analogue film used for entertainment in domed cinemas (e.g. IMAX), the VisionDome is driven by digital media, either pre-recorded or generated in real-time from a computer or High Definition TV camera.   • Designed to be deployed for 3D applications in which many people need to participate jointly. • Since there is only one projection source and nothing to wear, the VisionDome is the best solution for collaborative environments. Source: http://www.elumens.com

  22. Stereo & 3D Display Technologies Autostereoscopic Displays Forget the Funny Glasses • In the last 10 years, stereo displays that don’t require • glasses have emerged from the laboratories into the marketplace. • Autostereoscopic displays (ASDs) use several technologies to present different images to both of a viewer’s eyes. • No one technology has yet become dominant in the ASD marketplace. • Most common are systems based on flat panel displays (FPDs), which use either lenticular screens or parallax barriers to provide binocular disparity. QinetiQ's groundbreaking 3D Autostereo technology allows multiple viewers to see geometrically accurate and stable, 3D perspectives simultaneously. Source: http://www.qinetiq.com What Technology they use for ASDs: The manufacturers attempt to use optical tricks to aim the waves of light emitted by the monitor directly at the viewers eyes. If the viewer's head is within a certain area in front of the screen, the so called stereo zone, the scene will appear to be in 3D.

  23. Stereo & 3D Display Technologies Autostereoscopic Displays • Autostereoscopic Displays: • No Viewing Devices Required • Hardcopy (Such as: Free Viewing, Holographic Stereograms, Parallax Barriers, Lenticular Sheets) . • Alternating Pairs • Moving Slit Parallax Barrier (A variation of the Parallax Barriers) • The Sanyo Display • The DTI System • Seaphone Display • The Sanyo Display • The HinesLab Display • I, II and IV-VII are not covered

  24. Stereo & 3D Display Technologies Autostereoscopic Displays The DTI System The Dimension Technologies Inc With the DTI display, stereoscopic imagingis accomplished with a special illumination pattern and optics behind the LCD screen (figure 1) which make alternate columns of pixels visible to the left and right eyes (figure3) when you are sitting in front of the display (figure2), or in certain areas off to the side. One can see 3D from any position where the left eye is in a left eye zone and the right eye is in right eye zone. Additionally, there is little effective vertical restriction. Source: http://www.dti3d.com

  25. Stereo & 3D Display Technologies Autostereoscopic Displays The Sanyo Display The Sanyo Display • Use LC technology • Head tracking System • Use two image splitter • No ghosting Sanyo 3D Screen: 15 inch LCD monitor with non-glasses stereo 3D display. Uses eye-tracking. More information about different 3D displays at: http://www.stereo3d.com/displays.htm

  26. Stereo & 3D Display Technologies Volumetric Displays • Volumetric Displays • Also called Multiplanar 3D displays • >>>Several technologies of volumetric displays exist: • Oscillating Plane Mirror • Varifocal Mirror • Rotating Mirror Actuality Systems Volumetric 3-D Display http://www.actuality-systems.com/ -- Volumetric display systems (VDSs) create an image with true depth, letting the eyes and brain work in a natural manner. -- VDSs Normally depend on moving mirrors, rotating LEDs or other optical techniques to project or reflect light at points in space Crorepressor protein interacting with DNA

  27. Stereo & 3D Display Technologies Volumetric Displays Actuality System -- A stereo image hovering in free space, visible from any viewpoint. This is achieved by projecting the images onto a fast rotating surface. • -- Allows stereo vision, motion parallax, and proper accommodation. • -- Expensive!! • -- Since the display medium is transparent, it lacks the ability to produce occlusion. Therefore, this display system would not be ideal for video.

  28. Stereo & 3D Display Technologies Volumetric Displays Oscillating Plane Mirror Oscillating Plane Mirror • No disconnection of accommodation • All depth cues would be consistent • According to the focal length of The mirror, dramatic improvement in view volume depth can be obtained.

  29. Stereo & 3D Display Technologies Volumetric Displays Varifocal Mirror Varifocal Mirror • A commercial multiplanar • Use a flexible circular mirror anchored at the edges. • It is difficult to build a high quality varifocal optic that can be oscillated at high frequencies. A varifocal mirror display.

  30. Stereo & 3D Display Technologies Volumetric Displays Rotating Mirror Rotating Mirror • Use RGB lasers for point plotting and a double helix mirror rotating at 600 rpm as reflecting device • ASD and VDS systems are intended to replace current 3D displays, all of which require the user to wear some sort of filtering system, such as eyeglasses.

  31. Stereo & 3D Display Technologies Volumetric Displays New Technology

  32. Stereo & 3D Display Technologies 7. Retinal Scanning Technologies Stereoscopic Displays and Virtual Reality Systems X, SPIE Vol. 5006

  33. Stereo & 3D Display Technologies 7. Retinal Scanning Technologies Accommodation vs. Vergence

  34. Stereo & 3D Display Technologies 7. Retinal Scanning Technologies

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