[jitter] Re: Re: cv.jit tracking - LED's

why not track different colors instead? will eliminate the problems you
mention.

On Jan 3, 2008 10:30 PM, Stuart Binns <spbinns at hotmail.com> wrote:

>
> Thanks for all your help - I really do appreciate it.
>
> I have tried the 'sort' object, but it causes a problem for the type of
> installation I'm making.   The two blobs (formed from the LEDs) are mounted
> in a small handheld box (similar in size to a mobile phone), and the user
> moves this box whilst pressing on a stretched piece of dark canvas. The
> blobs appear on the underside of the canvas as white blobs (I used dark
> canvas so my camera would only see the blobs and no other light soures),
> which my iSight camera is facing. It is the blobs on the underside of this
> canvas that the patch follows.  The trouble with the 'sort' object is that
> when it looses an object/blob, I may assign it a new value when it
> reappears, so my tracking then fails as I cannot extract XY data from values
> 1 and 2 for example, as they have changed to 3 and 4. This was brought up in
> the forum recently, but unfortunately there was no further information...
>
>
> http://www.cycling74.com/forums/index.php?t=msg&goto=118099&rid=5914&S=2dba38dbb2631b21f0239d019bc0b7c8#msg_118099
>
> I tried the above, whereby banging the 'mode $1' on the cv.jit.labelobject until the labels correct themselves, but does not work very
> efficiently.
>
> Ideally, I would just like to be able to track both blobs, but although I
> selected '@mode 1' on the cv.jit.label, it does not set value 1 to be the
> biggest blob (as i thought it would), but the blob that appears closest to
> the top left corner. This was brought up here...
>
>
> http://www.cycling74.com/forums/index.php?t=msg&goto=120322&rid=0&srch=cv.jit.blobs+erik#msg_120322
>
> It seems that the 'sort' object is the object I need, but then there are
> it's problems- Catch22!!!
>
> I hope this all makes sense...
>
> Your help would be greatly appreciated.
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