Passive 3D stereo projection is based on light polarization. Both projection system and glasses use special filters with pass through light oscillating in one plane. Orientation of the filter on the projector must correspond the glasses filter. It is necessary to use special screen witch preserves the light polarization. The same system is used in IMAX 3D theater as well as in projection system offered by GALI-3D.
We use 2 projectors. Each projector is equipped by a specific polarization filter. Only light oscillating in one plane passes through the filter. The user use glasses with identical optical filters.
Advantages: Hi quality image at hi resolution. Method is suitable for large audience projection. No flickering.
Disadvantages: It is necessary to have 2 projectors. Special projection screen with non-depolarizing material is required.
Comparison of different 3D stereoscopic visualization techniques
Technology
Color information
Resolution
Suitable for projection
Monitor based visualization
Number of observers
Cost
Anaglyph
complete lose
middle
yes
yes
high
very low
Active stereoscopy
full
high
yes
yes (no LCD)
restricted
high
Passive stereoscopy
full
high
yes
no
high
middle
Autostereoscopic monitor
full
middle
no
yes
very restricted
high
The table table demonstrates suitability of different stereo visualization methods.
Passive 3D stereo projection is based on light polarization. Both projection system and glasses use special filters with pass through light oscillating in one plane. Orientation of the filter on the projector must correspond the glasses filter. It is necessary to use special screen witch preserves the light polarization. The same system is used in IMAX 3D theater as well as in projection system offered by GALI-3D.
cesky
english