Passive stereoscopic projection

Principles of passive 3D stereoscopic projection

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.

 

 

 
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