A median filter shall be a good start here On 10. August 2015 08:40:02 MESZ, Nicholas Mc Guire <der.h...@hofr.at> wrote: >On Sat, 08 Aug 2015, Peter C. Wallace wrote: > >> > >> > I think the trick the Resolute encoder uses is this: the image is >captured in >> > a perhaps sub microsecond flash of the LED, and then the "image" >can be >> > shifted out of the sensor at a leisurely rate. The specifications >sort of >> > suggests this (very fast capture (ns) time, but only multi KHz >maximum update >> > rate) >> > >> > Peter Wallace >> > Mesa Electronics >> > >> >> They may in fact use a laser for illumination as AFAIK you can get >higher peak >> power with a pulsed laser than a LED. These are in the $30 region for >75W peak >> 40 ns pulse width, not much vibration or motion blur in 40 ns :-) >> > >the problem is not the vibration in the 40ns >but that the recorded encoder image is more or less >a random position within the vibration range of >the device + vibration of the laser - I was thinking >about compensations like done with satelite images >where multiple pictures are taken and then the signals >are compensated by filtering out szintilation effects > >If the actual sampling is in the multi kHz range only then >that would be well in the modes that such systems can have >and one - worst case - would have the full vibration in >the positional information. Just wonder if there are any >detection algorithms that look into such issues. Naively >one could do a fft on the position data under the assumption >that motion should be constant/known-trajectory and that >could reveale such vibration/aliasing induced errors. > >> >http://www.osram-os.com/osram_os/en/products/product-catalog/laser-diodes/high-power-laser-diodes/pulsed-laser-diodes/hybrid-pulsed-laser-diodes/index.jsp >> >> ( thank you Harold Edgerton ) >> >thx! >hofrat > >------------------------------------------------------------------------------ >_______________________________________________ >Emc-developers mailing list >Emc-developers@lists.sourceforge.net >https://lists.sourceforge.net/lists/listinfo/emc-developers
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