[PD] Motion Detection Strategies - Gem

[Kyle Klipowicz]

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
-------------- next part --------------
An embedded and charset-unspecified text was scrubbed...
Name: q4smooth.pd
URL: <http://lists.puredata.info/pipermail/pd-list/attachments/20061006/477affc4/attachment.asc>