[PD] Motion Detection Strategies - Gem

[Kyle Klipowicz]

Ooops, this is not really interpolation at all, is it?  Hmmmm, anyone
know the REAL solution?

~Kyle

On 10/6/06, Kyle Klipowicz <kyleklip at gmail.com> wrote:
> Attached is a quick example of this.
>
> ~Kyle
>
> On 10/6/06, Kyle Klipowicz <kyleklip at gmail.com> wrote:
> > Hi David~
> >
> > Smoothing control signals can be done by using a line object.
> >
> > [inlet jittery_signal]
> > |
> > [pack f 100] (100 ms linear smoother)
> > |
> > [line]
> > |
> > [outlet smooth_signal]
> >
> > You can also easily experiment with different forms of interpolation
> > if you scale your control range over the interval [0, 1].  A quartic
> > interpolation would simply be like this:
> >
> > [inlet scaled_line]
> > |
> > [expr pow($f1, 4)]
> > |
> > [outlet quartic_envelope]
> >
> > For averaging, I believe that .hc has made some nice ones for his HID
> > library that would suit your purposes.  Or, you could use a list of
> > however many "control samples" you'd want to average, and then operate
> > on them with fbar's list-abs.  Or, you could do something like this
> > with iemmatrix too.  There are even some control rate objects like
> > lowpass filters and such.  There's a ton of possibilities!
> >
> > ~Kyle
> >
> > On 10/6/06, David Powers <cyborgk at gmail.com> wrote:
> > > Hi everyone,
> > >
> > > I bought a cheap Logitech webcam to try motion detection with PD+Gem.
> > > I'm considering, among others things, using this as part of a digital
> > > instrument design.
> > >
> > > First of all, the cheap webcam is of course rather noisy. But, the
> > > motion detection doing:
> > >
> > > [pix_movement 0.3]
> > > l
> > > [alpha]
> > > l
> > > [pix_blob]
> > >
> > > definitely does seem to work okay.
> > >
> > > I did a test using the X and Y to control FM synthesis however, and it
> > > mostly worked but tended to produce a lot of noise when something was
> > > moving. What is the recommended way to smooth out the signal a bit?
> > >
> > > Also, best way to find the average speed of motion?
> > >
> > > Finally, are there more advanced motion detection strategies? Like,
> > > say, could I somehow put a bright red dot on my index finger, and just
> > > detect where my index finger is? I'd love to hear what people have
> > > done.
> > >
> > > I also wonder, how the hell I would set it up for a real performance -
> > > Experimental music concerts here tend to be in small alternative sorts
> > > of venues, with not much space.
> > >
> > > ~David
> > >
> > > _______________________________________________
> > > PD-list at iem.at mailing list
> > > UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list
> > >
> >
> >
> > --
> >
> > http://theradioproject.com
> > http://perhapsidid.blogspot.com
> >
> > (((())))(()()((((((((()())))()(((((((())()()())())))
> > (())))))(()))))))))))))(((((((((((()()))))))))((())))
> > ))(((((((((((())))())))))))))))))))__________
> > _____())))))(((((((((((((()))))))))))_______
> > ((((((())))))))))))((((((((000)))oOOOOOO
> >
>
>
> --
>
> http://theradioproject.com
> http://perhapsidid.blogspot.com
>
> (((())))(()()((((((((()())))()(((((((())()()())())))
> (())))))(()))))))))))))(((((((((((()()))))))))((())))
> ))(((((((((((())))())))))))))))))))__________
> _____())))))(((((((((((((()))))))))))_______
> ((((((())))))))))))((((((((000)))oOOOOOO
>
>
>


-- 

http://theradioproject.com
http://perhapsidid.blogspot.com

(((())))(()()((((((((()())))()(((((((())()()())())))
(())))))(()))))))))))))(((((((((((()()))))))))((())))
))(((((((((((())))())))))))))))))))__________
_____())))))(((((((((((((()))))))))))_______
((((((())))))))))))((((((((000)))oOOOOOO