Thursday, November 13, 2008

Scratch Input and Low-Cost Multi-spectral material sensor

Chris Harrison, a PhD Student at my old program at CMU, presented a couple projects of his at UIST 2008 that I really really like. The first is his "Scratch Input" device. The basic idea is that if you place a senstive microphone on the bottom of a mobile device. Any large, hard surface you put it down on can now be used as an input gesture surface. A variety of gestures can be distinctly and reliably detected with some simple machine learning. Video (academic) below include a nice demo where he turns his entire wall into an MP3 player controller:



The other project he presented was a simple, cheap multi-spectral sensor for recognizing various materials. It includes an IR LED, UV LED, RGB LED, a photoresistor, and a TSL230 TOAS optical sensor. With these, he read the reflectively under different illuminations to recognize 27 different materials with 86.9% accuracy, be this your jeans, your backpack, your desk at home, your desk at work. This means coarse location awareness of mobile devices for cheap, some opportunities for more intelligent power management, and implicit security behaviors when placed on familiar or unfamiliar surfaces. Very nice work.

53 comments:

  1. Thanks a lot for posting these findings :)

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  2. wow... just one keyword: monitoring.

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  3. I suggest use two or three sensor to detect the position of scratch source.

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  4. btw, you can add some filter in front of the sensor to focus the sound wave.
    ref: google "focus without mirror or lens". it's just simple FFT

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  5. What golden grape said. Seems like you could use multiple audio sensors and some triangulation to turn your entire desk/wall/whatever into a touchpad.

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  6. good explanation!
    I can see the possibility, but I don't know how.
    what a pity! I'm not a PhD :(

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  7. @ golden grape, duality72:

    there is a group that has done exactly as you surmise re: position sensing, though they seem to have used 4 sensors instead of 3 (not sure why).

    http://www.taichi.cf.ac.uk/

    I think both of these approaches have merit for respective applications, cool stuff!

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  8. It's a nice project. It could have lot of applications.
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  11. Seems like you could use multiple audio sensors and some triangulation to turn your entire desk/wall/whatever into a touchpad.
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