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 czhenry@gmail.com 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 langcsaba@gmail.com 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,
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