What is 3D-stereoscopy
The basic principles of 3D stereoscopic visualization are not extremely complex
 There exist a lot of technologies cold 3D. Most of them just only transfer 3D data into a 2D image. One of the technologies witch could be truly cold 3D is stereoscopic visualization. Only this stereoscopic 3D visualization shows all dimensions of the objects.
For true perception of objects depth (like e.g. in the IMAX 3D cinema) it is necessary to visualize not only one 2D image, but at least two separated one for each human eye. The source image must be recorded by multiple camera or the in the case of CG, the view on the scene must be generated from multiple positions. In addition we must use technologies delivering the proper image just only to the proper eye. Only in this case the human brain is able to determine the full 3D depth of the scene.
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The image shows a human brain analyzing 3D stereoscopic scene. Each eye sees different image. The brain utilizes the disparities in this to images for depth perception. |
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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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IMAX 3D use stereoscopy
Nowadays, the stereoscopy is used in IMAX 3D theatres. IMAX theatres use passive stereoscopy based on light polarization. The necessary light flow is extreme, both recording and projection is very expensive.
Just now both IMAX and other companies working in the branch try to switch to fully digital technology, not based on film material. |
What means 3D?
3D means 3 dimensions. Unfortunately most of the 3D technologies only transform data from X,Y,Z 3D coordinates into 2D X,Y coordinate system. For true 3D technology wee need to visualize the depth - Z coordinate.
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