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Image projection

The projection at the Beethoven-House is a passive 3D stereo projection using two D-ILA projectors from JVC, model DLA-G150CL. Each projector has an SXGA resolution of 1280 x 1024 pixel and a brightness of 1,000 ANSI lumen. Both projectors are housed in a customised sound insulation box. A slightly tilted silver coated Stewart Screen with a width of 9.8 feet and a height of 6.6 feet serves as screen. The installation was carried out by Viscon.

To generate a spatial 3D impression, the software calculates two different images in real-time at a frequency of 30 images per second: One image from the perspective of the left eye and one slightly shifted image from the perspective of the right eye. A frequency of 30 images per second is applied. To make sure that the audience recognises these two different images with the correct eyes, two projectors are used to project separate images for the left and right eye on the screen.

Using a polarisation foil with horizontal and vertical polarisation in front of the respective projector, the image for the left eye is displayed on the screen in horizontally polarized light and the image for the right eye in vertically polarised light. The audience wears special glasses featuring different polarisation foils so that the left eye sees only the image intended for it. The same applies to the right eye respectively. Both images are then composed in the human brain and form a spatial 3D image, making the illusion complete.

The graphics computer is from DELL and features two Intel processors (3.2 GHz) and FX graphics from Nvidia.