http://halfdanj.dk/blog/2009/01/multitouchtable-prototype/ Jonas Jongejan Sun, 28 Aug 2011 22:33:21 +0000 hourly 1 http://wordpress.org/?v=3.3.1 http://halfdanj.dk/blog/2009/01/multitouchtable-prototype/comment-page-1/#comment-3395 nice touchscreen project featuring difused illumination - antima55 Wed, 23 Dec 2009 23:40:14 +0000 http://halfdanj.dk/blog/?p=189#comment-3395 [...] halfdan j says: The surface is a thin glass plate with a Lee filter 400 underneath to project on. In the bottom of the box there is an ordinary surveillance camera with a IR filter in (so it only sees infrared light, and not visible light), and a BenQ short-throw projector and a lightbulb wrapped in some color filters. it does give some visible red light, but its not very much. This technique is called DI (Diffused Illumination). Share/Bookmark [...] [...] halfdan j says: The surface is a thin glass plate with a Lee filter 400 underneath to project on. In the bottom of the box there is an ordinary surveillance camera with a IR filter in (so it only sees infrared light, and not visible light), and a BenQ short-throw projector and a lightbulb wrapped in some color filters. it does give some visible red light, but its not very much. This technique is called DI (Diffused Illumination). Share/Bookmark [...]

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