Interactive Multi-Touch Projector Screen!
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Here’s a really cool demo of an interactive projector screen or is it Multi-Touch Projector?
The basic idea is really simple: a program running on the PC will process the images viewed from the webcam, find the position of the penlight/light spot, and use this position to deternine where to place the mouse cursor on the screen. Now, if we can assume that the light spot/point is always the brightest object in the area, than the detection algorithm will be very simple: find the location of the pixel with the highest intensity level. We make use of two additional useful facts: 1. a normal pocket touchlights (or any incandescent lamp for that matter) actually emits several times more infrared light than visible light, and so works better as IR point source than a visible light source. 2. most webcam are able not only to detect visible lights (red, green and blue, etc) but they can also detect infrared (IR) lights – for example as emitted by the IR LEDs commonly found on TV/Hifi remote controls – which are invisible to the human eyes. So if we can somehow use the webcam to capture only the infrared lights from our light source and reject the surrounding visible lights, we will be ensured of a very reliable system. An additional feature of this system will be it will work if we replace the torchlight with any IR LEDs.”
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Loading ...Crank TV Remote with No Battery!
Here’s a prototype TV remote that works by user squeezing the handle to generate little itty bits of electricity to change the channel or the volume. Nice work, this might be the start of many other battery-free remote controls.
This is the No Battery Remote Control by the SMK Corp. it works on the principal similar to one of those toy ray guns, where the user squeezed the trigger a few times and it began to light up the lights and make futuristic sounds. This RC has a similar mechanism which is enough to power the RC for a few changes of channel and maybe even volume control too. It’s a prototype at the moment, but it has to be the best green TV remote around.
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- Crank TV Remote with No Battery!
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