am I missing something?
had assumed this was basic motion detection with parallax?
has no one stripped one down yet?
best
Jonathan
http://www.networkworld.com/news/2010/110410-microsoft-kinect-teardown-ifixit.html
(not read...)
On 18 Nov 2010, at 15:22, Dirk-Willem van Gulik wrote:
...all this bumpf about how fancy they are[0] is just a load bollocks.
I am wondering if them Kinect things are really working a lot
simpler; and after waking up in the middle of a shower am now
postulating that:
1. They have a simple static laser interference pattern (e.g. akin
to [1] or those
star projectors you can buy from street vendors).
2. However this one is very very fine and nicely randomish. i.e.
dots less than a few
mm appart.
3. They use a crappy low resolution normal monochrome web cam; with
a black bit of glass so
only IR gets let through.
4. They simply pass the image of this camera back.
The reason that this works is that every 'pixel' at CCD level for
distances of working range will have 1 to 100 or so 'tiny dots' on
it - depending on the distance it is at. Which is why we have
roughly the range we get; why we have such a near perfect 1/sigma
callibration curve and why the range of values you get it so odd -
and why they filter certain types of noise so badly.
And perhaps, perhaps:
5. They do a phase locked loop amplifier loop in software by
flashing the projector.
But I doubt that given the noise/error artifacts.
And that is really all there is to it. Anyone here with a good high-
res SRL which can do enough IR detection to check if indeed this is
the case ? I guess a fun test would be to use a mirror to project a
few extra pixels onto a flat area - and see if that area suddenly
jumps 'forward'.
Thanks,
Dw
0: http://www.wired.co.uk/magazine/archive/2010/11/features/the-game-changer
and all the mystification on how they work.
1:http://www.zimbio.com/Popular+Topics+in+Astronomy/articles/vnjstT2fTM2/Green+30mw+Laser+Pointer+Pen+Style+Star+Holographic
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