Active Stereo & Passive Stereo - Barco UDX Series User Manual

8.12.1 Active Stereo & Passive Stereo
What is Passive Stereo?
Passive Stereoscopic 3D (also known as "Passive Stereo") is the standard method of creating the illusion of
depth in an image, by means of stereopsis for binocular vision.
To present stereoscopic pictures, two images are projected superimposed onto the same screen through
polarizing filters or presented on a display with polarized filters. For Digital Cinema, a silver screen is used so
that polarization is preserved. On most passive displays every other row of pixels are polarized for one eye or
the other. This method is also known as interlacing.
The viewer wears glasses which contain a pair of opposite polarizing filters. As each filter only passes light
which is similarly polarized and blocks the opposite polarized light, each eye only sees one of the images, and
the effect is achieved.
What is Active Stereo?
Field sequential 3D (also known as active 3D or "Active Stereo") is a technique of displaying stereoscopic 3D
images. It works by only presenting the image intended for the left eye while blocking the right eye's view, then
presenting the right-eye image while blocking the left eye, and repeating this so rapidly that the interruptions
do not interfere with the perceived fusion of the two images into a single 3D image.
This system setup uses liquid crystal shutter glasses (also known as active shutter glasses). Each eye's glass
contains a liquid crystal layer which has the property of becoming opaque when voltage is applied, being
otherwise transparent. The glasses are controlled by a timing signal that allows the glasses to alternately
block one eye, and then the other, in synchronization with the refresh rate of the screen. The timing
synchronization to the video equipment may be achieved via a wired signal or via wireless communication,
this by using either an infrared or radio frequency (e.g. Bluetooth, DLP link) transmitter.
Projection method used
This projector can only show active 3D images, used in combination with a 3D emitter and active shutter
glasses. While it is allowed to connect passive stereo source signals, the image processing of the projector
will convert those signals to an active 3D compatible image.
The options on the projector software allow you to fine-tune the 3D settings accordingly to the specifications of
the 3D emitter.
If a 3D emitter is used that radiates IR beams, the IR beams may interfere with the IR
communication between projector and the RCU. If such interference occurs, connect the RCU to
the projector using the remote cable. It is also advised to turn the IR receivers on the projector off to
avoid the 3D emitter interference. To turn off the IR receivers, see "Remote control, on/off button",
page 27.
GUI – Installation
R5906112 /09 UDX series 141