Barco CADWall Manuel utilisateur

Stereoscopic Projection

3D PROJECTION TECHNOLOGY

innovators in image processing

Stereobrochure 02-06-2003 15:38 Pagina 1

right eye

left eye image right eye image

stereoscopic projection

left eye

The Principle of 3D Imaging

Due to the 4-6 cm (1.6-2.3 inch) separation

between the eyes, each eye has a slightly

different viewpoint. The images from these

two different viewpoints are sent to the

brain and this difference, which is termed

parallax, is interpreted as depth.

Stereoscopic projection is based on the same

principle: two slightly different images are

projected onto the screen and the imaging

system must enable the left eye to see only the

left eye image, and the right eye to see only

the right image.

Barco’s quality of separation guarantees

that the images of the two eyes are separated

and displayed in such a way that the final 3D

images appear fully focused and not

blurred.

Barco: The Qualit

Chemists analyze complex molecular

structures and simulate how new drugs

might interact with the human body.

Oil and Gas specialists determine where to

drill by virtually exploring geoseismic data of

the earth below its surface.

Edutainment is especially captivating when

one is immersed in a virtually created

imaginary world.

Engineers experience new designs virtually

before they are actually produced.

BrookHaven National

Laboratory,

New York, USA.

Photo courtesy of

Tom Sobolik.

Photo courtesy of

Rover, UK.

Photo courtesy of

Polytechnic University,

Hong Kong.

Photo courtesy of

Schlumberger

Dairy Ashford, Texas,

USA.

Stereobrochure 02-06-2003 15:38 Pagina 2

ity Solution for Stereoscopic Viewing

Barco offers a complete range of high-end

projection platforms covering all technologies - CRT,

LCD and DLP™ - for active and/or passive stereo

applications.

High quality optional application-specific

optimizations for multi-screen stereoscopic

projection onto flat, curved and dome-shaped

screens result from years of experience in the field.

Barco’s projection solutions include:

• Optimized mechanics and screens

• Proprietary high-quality eyewear

• Software for dedicated image distortion and easy

adjustment and maintenance

Barco has a proven track record of high-quality

installations in the most demanding 3D markets

worldwide.

Automotive designers evaluate the looks and ergonomics of future cars, reducing the costly

and time-consuming effort of physical prototyping.

Stereobrochure 02-06-2003 15:39 Pagina 3

1 DLP™Projector

1 CRTProjector

Pair of passive stereo glasses

Images at double

refresh rate on a

non-depolarizing screen

Stereo-enabled DLP™

or fast-phosphor green

CRT projector

ZScreen

The ZScreen for a DLP™ (Digital Light Processing™)

projector such as the BARCO GALAXY is smaller because

it must cover only one lens, while a CRT projector has

three lenses.

LCD projectors cannot operate at a high enough

vertical refresh rate to produce a high-quality stereo

display with a single projector (at least 96 Hz is

recommended).

When using CRT projection a "fast-phosphor"

green CRT is needed to obtain the required high

refresh rate. Barco CRT projectors such as the

BARCOREALITY 908, 909 and 912 can be delivered with

this option already installed.

Barco has developed very high quality passive stereo

displays based on the principle of light polarization.

The viewer wears a pair of glasses containing two

oppositely polarized filters - one for the left eye and

one for the right eye. The light from each of two

projected images is polarized and can only pass

through its corresponding filter.

With a Single Projector

• The projector alternates the left eye information with

the right eye information at double refresh rate.

• A ‘ZScreen’ in front of the projector’s lenses

alternates the polarization of the projected image

in such a way that the image of each eye passes only

through its corresponding polarizing filter of the pair

of passive stereo glasses.

Passive

Passive3D DISPLAY SYSTEMS

Photo courtesy of Terminal V, Austria.

Stereobrochure 02-06-2003 15:39 Pagina 4

Pair of passive stereo glasses

Non-depolarizing screen

Two CRT or DLP™projectors

With Two Projectors

One projector displays the left eye information and the

other displays the right eye information, both at a

standard refresh rate.

A polarizing filter mounted in the optical light path

of each projector ensures that the correct information

passes through its corresponding filter in the pair of

passive stereo glasses.

This two-projector approach has the added value of

providing higher brightness.

A light wave rotates in any direction. The specific

orientation at any given moment determines the

polarization of a light wave. By passing unpolarized

light through a polarizer, only one of its orientations

emerges.

By organizing the polarization oppositely for the

left and right eye we can direct different

information to the left and right eye, thus creating

depth perception. As the human eye itself is largely

insensitive to polarization, changing the orientation of

polarized light does not change what we see.

Linear & Circular Light Polarization

Linear Polarization

If light is polarized in a single direction (north/south,

east/west, or even oriented diagonally), it is defined as

linear polarization. When one changes the orientation

of linear-polarized glasses by tilting his or her head, so

that the resulting orientation of polarization does not

match that of the polarization filter mounted on a

projector, there will be a loss of stereo information as

perceived by the viewer.

Nevertheless, linear polarization is a cost-effective

technology that can produce excellent image separation

between the left and right eye, for stereoscopic

applications whereby head tilting is limited.

Linear polarized light

Circular polarized light

2 CRTProjectors

Although weaker in light output, a CRT projector

allows for the highest resolution large screen

images, with unparalleled visual fidelity.

Barco CRT projectors offer a motorized polarization

filter as an option for stereoscopic projection, whereby

the filter can be rotated away from the lens for

standard non-stereoscopic projection.

2 DLP™Projectors

In high ambient light conditions or for very large

screen applications, this solution is optimal.

Barco offers a range of high-quality DLP™ (Digital

Light Processing™) projectors with light output from

5,000 to 18,000 ANSI lumens. For stereoscopic use,

however, “stereo lumen” - which equals less than half

the ANSI lumen value - is the realistic measurement

of brightness.

Passive

Passive3D DISPLAY SYSTEMS

Stereobrochure 02-06-2003 15:39 Pagina 5

Pair of passive stereo glasses

Images at double

refresh rate on a

non-depolarizing screen

Two 3D optimized

LCD projectors

Linear-polarized Barco glasses are matched to linear-

polarized Barco projectors, and they offer an excellent

quality-to-price value for stereo viewing with large

audiences.

Circular Polarization

With circular polarization, the viewer can tilt his head

and change his viewing angle relative to the

stereoscopic projection display, because the light is not

polarized in a single direction.

As this high-end technology demands greater

precision and requires a tighter match between the

polarizing filters in the light path of the projectors and

those in the glasses, the use of Barco high-quality

circular eyewear is recommended.

Easy to use and comfortable to wear, polarized

passive stereo eyewear have no active components and

are thus very affordable for large audiences.

Overview Barco glasses: www.vr.barco.com

Some alternative technologies available today, like

Barco INFITEC, incorporate stereo information into the

color wavelengths of the projected image.

This solution results in excellent separation, especially in

combination with DLP™ projectors, while reducing the

color range and brightness.

Barco’s MICATM, MINI CADWALL.

(Photo courtesy of Schlumberger, GeoQuest)

Single Active Stereo > Passive Stereo

The BARCO DUET converter splits an active stereo

image into a left and right eye component and

then passes these two images to the two corresponding

internally polarized BARCOREALITY SIM 6 projectors.

Barco DUET

The active-to-passive stereo converter for the BARCOREALITY SIM 6

projector offers automated left/right signal and sync detection and

automatically chooses the resolution and refresh rate for optimal

passive stereo display.

one double refresh rate

active stereo signal two passive

stereo signals

Dual-stacked

BARCOREALITY SIM 6

Workstation with

one graphics output Barco's DUET

one double refresh rate

active stereo signal two passive

stereo signals

Dual-stacked

BARCOREALITY SIM 6

Workstation with

one graphics output Barco's DUET

2 LCDProjectors

Barco LCD projectors are each internally

polarized to its corresponding left and right eye

information, eliminating the requirement for external

filters. With Barco’s internal polarization 70% of the

original light output is maintained, making this

technology the most efficient method available to

obtain high stereo lumen brightness levels.

DUET

Barco’s high-quality circular eyewear

13mm afsnijden

Stereobrochure 02-06-2003 15:39 Pagina 6

Single Projector, Double Refresh Rate

The viewer wears special eyewear comprising two IR-

controlled LCD light shutters working in

synchronization with the projector. When the

projector displays the left eye image, the right eye

shutter of the active stereo eyewear is closed, and vice

versa. The single projector used must be capable of

displaying at a refresh rate high enough that the

viewer does not perceive a flicker between alternate

frames.

Pair of active stereo glasses

Images at double

refresh rate

Stereo-enabled DLP™

or fast phosphor green

CRT projector

Emitter

Photo courtesy of ItalDesign, Italy.

1 CRTProjector

Due to the higher refresh rate of the incoming

signal, a projector with a ‘fast phosphor’ green CRT

is required. Barco’s CRT projectors can be delivered

with this option already installed.

1 DLP™Projector

The BARCO GALAXY stereoscopic DLP™ projector

offers stereo capabilities at SXGA resolution up to

110Hz. This higher refresh rate is complemented by an

extremely bright and high-contrast image, resulting in

an active stereo 3D projection display of unparalleled

clarity and vividness.

Active

Active3D DISPLAY SYSTEMS

13mm afsnijden

Stereobrochure 02-06-2003 15:39 Pagina 7

Stereo

LCD

CRT

DLP™

Lumens

With stereo projection, light output is at least

halved in the process of creating a separate left and

right eye picture. Projectors employing different

technologies but with the same ANSI lumen specs can

give quite different stereo lumen results. The stereo

lumen is the only practical value for accurately

measuring brightness in Virtual Reality applications.

BARCOREALITY 909

The motorized polarizing filter can be

disengaged by remote control for

full brightness in non-

stereo mode. BARCO GALAXY DLP™

An impressive 205 MHz A/D conversion

bandwidth ensures compatibility with high resolution

and high refresh rate sources for active stereo.

Fast Green Phosphor

CRT projectors offer a high dynamic range,

displaying detail from bright highlight areas to dark

shadow areas. Color matching and color uniformity is

excellent.

For active stereo applications, where double refresh

rates are required, the persistence and decay time of

the phosphor on the green cathode ray tube (CRT)

must be shortened.

Barco offers active stereo CRT projectors with fast-

phosphor green tubes at sizes of 7", 8", 9", and even

12”.

BARCOREALITY SIM 6

This LCD projector, which is specially

designed for applications in Simulation and

Virtual Reality, offers built-in Warp6TM

non-linear image mapping technology.

Warp6TM enables high-order pre-distortions

electronically with virtually no frame delay,

for use with curved-screen and dome

applications.

The BARCOREALITY SIM 6 projectors

shown here are equipped with Barco’s

external blending plates, for seamless soft-

edge matching across multi-channel displays.

Internally Stereo Optimized

By internally polarizing Barco LCD projectors, external

polarizing filters are not needed, thus avoiding the

excessive light loss caused by external polarization. In

this way Barco LCD stereo-optimized projectors are able

to maintain about 70% of the original light output.

Barco’s Transport Delay Reduction technology

essentially eliminates the delay between the input

signal and the projected image for optimal real-time

interaction with projected images.

Light Efficiency

BARCO GALAXY

Barco’s multi-channel-capable stereo-optimized

GALAXY, equipped with DMD™ (Digital Micromirror

Device™) optimized polarizers, displays active stereo at

SXGA resolution up to 110Hz.

Barco’s SyncLock technology ensures synchronization

between the Image Generator, the BARCO GALAXY

and the active stereo shutter glasses.

For passive stereo, Barco offers a range of DLP™

projectors with light output from 5,000 to 18,000 ANSI

lumens.

more product info on www.vr.barco.com

Stereobrochure 02-06-2003 15:39 Pagina 8

> ACTIVE STEREO

As the projector sequentially projects the left and right

eye images, the duty cycle is 50%. However, the extra

blanking between the left and the right image that is

required to ensure a good stereo separation further

diminishes the light output, resulting in an

efficiency of about 45%.

Due to polarizing filters that are utilized in active

stereo eyewear, each eye receives less than half of

the remaining light. As the shutter glasses do not

open and close instantaneously, and due to the light

lost from the polarization, efficiency of the active

stereo eyewear is rated at about 35%. The overall

efficiency of the active stereo process therefore

equals about 45% x 35%, or approximately 16%.

The influence of the screen has not been taken into account in the pictures.

Indicative average values depend on materials used.

yellow = polarized light

-55% -65%

16%

SINGLE CRT OR DLP™ PROJECTOR

The unpolarized light coming from each projector is

externally polarized, which diminishes the brightness

by more than half and reduces the efficiency to about

45%. Then the polarized image is viewed through

LCD panels polarize the light that passes through them

in different directions. Through the use of internal

polarization Barco is able to maintain about 70% of

the original light output.

Combined with the 84% efficiency of the passive

glasses an overall projection efficiency of 59% is

reached.

passive stereo glasses that transmit the polarized

light at about 84% efficiency, resulting in a final

efficiency rate of approximately 38%.

When a ZScreen is used to polarize the light, a single

projector is driven in active stereo mode. As a ZScreen

is even slower than active glasses more blanking is

needed between the left and right signal, resulting in a

duty cycle efficiency of about 40%.

The ZScreen polarizes light with a brightness efficiency

of about 35%. With the passive stereo eyewear

having an efficiency rating of 84%, the final efficiency

rating is about 12%.

>PASSIVE STEREO

-55%

-16% 38%

-60% -65% -16%

12%

-30% -16% 59%

TWO CRT OR DLP™ PROJECTORS

SINGLE PROJECTOR WITH ZSCREEN

TWO LCD PROJECTORS

Stereobrochure 02-06-2003 15:39 Pagina 9

Mirror

Wide

Although the projection screen is one

of the key components in a display

system, its significance is often

overlooked. The type of screen

technology employed is critical for

multi-channel displays and especially

for passive stereoscopic projection.

In close collaboration with the world’s

leading screen suppliers, Barco is

constantly evaluating the latest screen

technologies and has developed

proprietary and customized screen

solutions for the most demanding

applications.

Advanced Screen Technology

There is no magic screen material nor

configuration or set-up that performs

perfectly for every installation

Viewing Angles

Providing wide horizontal and vertical viewing angles and

maintaining consistent corner-to-center brightness levels are

essential for large-format stereoscopic projection display systems.

In order to eliminate hot spots and color shifts the gain and

diffusion properties of a screen must be matched precisely

to the type of projection technology utilized (CRT, LCD, or DLP™).

The positioning of the projectors (on-axis or off-axis), their

brightness level, and the type of stereoscopy (active or passive)

are important considerations as well.

Barco offers screens that can be

optimized for diffusion with different

gain factors. Total half-gain angles

can range from 45 to 100 degrees,

depending on the specific needs of

the application.

Configurations

To minimize the floor space required for rear-projection

installations, optical mirror systems are often used to fold the

light path. Barco uses only specially selected front-coated mirrors

of the highest quality. Advanced 3D engineering software is

utilized to calculate the optimal positioning of the mirrors,

projectors, and screen, as the complex light paths within a

projection display system are precision-designed to the tightest

tolerances possible.

Stereobrochure 02-06-2003 15:40 Pagina 10

Ce manuel convient aux modèles suivants

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