posted 09-22-2015 03:34 PM                    

quote:

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Ten synchronized and mapped projections covered the screen with 200,000 lumens, creating one continuous giant image

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posted 09-24-2015 01:12 AM                    

quote: Scott Norwood

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The setup at the UN in that video (above) looks amazing. Not so much for movies, but the animation on that big curved screen works well for the performance. There is a surprisingly large number of people doing interesting things with projection for live performances like this. I would be curious to know how they achieved even focus on the deeply curved screen (cyclorama?).

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The great thing about such large, wrap-around screens is that it creates a seamless experience. It's not like looking trough a bunch of badly aligned windows, it's much more like being there.

The focus here really is a non-issue, because the image is stitched together using a whole array of projectors, in this case about 9 projectors. Every projector just covers a small part of the screen so you only have to worry about the focus in this part. The difficult thing is making them overlap seamlessly. The biggest problem here isn't even the pixel mapping, there's software that gets the job done for you, but getting the brightness right, especially in the overlap regions and for dark scenes. In the days of CRT projectors, this wasn't really a problem, because black is pretty much black, but DLP projectors leak an awful lot of light and stack the image of multiple projectors over each other and you're going from dark grey to light grey.

Some of the better edge-blending setups therefore use special blending filters in front of the projector lenses. Those assemblies aren't always practical, but get the job done pretty well.

posted 02-06-2016 06:08 PM                    

quote: John Roddy

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Nothing. The screens are perforated, so any speakers already on the wall are totally OK. The side screens cover up two speakers each, but it didn't really make an audible difference.

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