Hacked Gadgets Forum

July 25, 2008

Interactive Projector Screen

at 6:57 am. Filed under Computer Hacks, Cool Gadgets, Game Hacks


We have seen lots of Projector Screen hacks over the last few years, this one demos the power of the system quite well. It doesn’t take much hardware to provide some fantastic results! The video game gun use is a natural extension of the technology.

"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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6 Responses to “Interactive Projector Screen”

  1. Sam Ridden Says:

    I remember seeing this one a while ago when I was looking into alternatives to using Wiimotes to make interactive whiteboards, does anyone know if this particular project has released any source or binaries? I’d love to give it a go!

  2. Mr. Maigo Says:

    We’ve had one in the mall for at least a year

  3. Interactive Multi-Touch Projector Screen! | zedomax.com - Obsessively profiling DIYs, Hacks, Gadgets, Tech, Web2.0,and beyond. Says:

    […] via hackedgadgets Computer, Consumer, Cool, demo, detection algorithm, DoItYourself!, Educational, Entertainment, Gadgets, HOWTO, human eyes, images, incandescent lamp, infrared light, infrared lights, intensity level, Microwave, mouse cursor, pixel, point source, projector screen, Projects, remote controls, several times, technology, torchlight, tv hifi, visible light source, webcam […]

  4. Sam Ridden Says:

    Fair enough, but this is a homemade webcam/laser pointer solution, not house of the dead in the arcade cabinet

  5. amir Says:

    i need the laser control from the webcame project
    plz send it to me as fast as u can

  6. Madeleine Tarlton Says:

    it .. i vorgemerkt und es werden wieder an check it out

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