Chuck, thanks for the hint, sounds good. I will give a try tomorrow, but already started to have some other solutions, and I played with time delay. I mean under it to compare XYZ coordinates in time, if delta is close to the noise, than I expect that the object (hand) is still. However, there are bigger problems, as the hand disappears if the hand touches the background, in this case I have a lost hand. Assuming that I lost on the very last position, just before touching the wall, I can get a quite close parameter of the hand. Still need some tests, but together with yours probably can have a better assumption.
Best, Popesz On Sun, Feb 2, 2020 at 12:56 AM Charles Z Henry <[email protected]> wrote: > Hi Popesz, > > At least on kinect, there's always a bit of noise in the tracking. > The change from frame-to-frame will never be exactly 0, so you need > something that acts more like a threshold. > > One place to start would be collecting some data on the amplitude of > the noise when you're doing what you'd consider standing still. > For one dimensional data, you just want to see how big is the typical > value of |x(n)-x(n-1)|. For more dimensions, you need sqrt sum of > squares on the differences > > Then, I'd probably give it a exponential decay weighting and compare > against a threshold that is just some factor larger than the basic > noise amplitude. > > 1-D: > [r coordinate] > | > [t f f] > X > [- 0] > | [r fb] > | [* 0.9] or some other factor <1 > [+ 0] > |\ > | [s fb] > | > [expr $f1 < 10] > | > [select 0 1] > > My kinect data is all over the place. The device is really sensitive > to lighting, background detail, and so on. You should consider that > the noise may be larger sometimes depending on where you're using the > sensor. > > Chuck > > > On Sat, Feb 1, 2020 at 2:58 PM Csaba Láng <[email protected]> wrote: > > > > Dearest list, > > > > is there any object which only gives me a value from a constantly > changing random numbers when it stops for a while, let's say for one second > or so? > > I am looking for the parameters of tracking hands from Kinect like > motion detector when the hands stops on an object for a while. > > > > Best, > > > > Popesz > > _______________________________________________ > > [email protected] mailing list > > UNSUBSCRIBE and account-management -> > https://lists.puredata.info/listinfo/pd-list >
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