[PD] Multiblob and matrices...

[Simon Ball]

Thanks for the response. However, I am still struggling with this. I
probably need a much more basic explanation. Sorry.

I assume that the patches you've provided (greatly appreciated) collate the
data in someway in order for me to be able to unpack it? However, I'm not
sure that I even understand exactly how 'unpack' and 'route' work, which is
obviously a problem!

If anyone can provide a more simplified explanation I would really
appreciate it. I'm not that familiar with programming, so layman's terms are
all I can manage!

Thanks
Simon

On Sat, Apr 4, 2009 at 2:14 PM, IOhannes m zmoelnig <zmoelnig at iem.at> wrote:

> Simon Ball wrote:
> > Hi List
>
>
> hi.
> it seems like i received this email multiple times...
>
> >
> > However, there are few areas I am still confused about. First of all, I
> am
> > unsure of how to extract muliple co-ordinates from [pix_multiblob]. I
> > understand that the data from multiblob is collated within a matrix. I am
> > able to see this in the pd window when I print. However, I am unsure how
> to
> > use a matrix. Is there a certain object that I should be sending to from
> > [pix_multiblob]? And in turn, how would I convert the matrix into xy
> > co-ordinates.
>
>
> there is a separate library dedicated to the kind of matrices output by
> [pix_multiblob]; it's called "iemmatrix".
>
> however, you should have an understanding of matrices in order to use it.
>
> matrices of this form are simple messages which you can treat like any
> other message.
> attached are two examples on how to extract the rows of a matrix (and
> pix_multiblob will give you one row per blob; so this is interesting
> data), one using iemmatrix ([pix_rows]) and one using zexy ([pix_rowz]).
> it is left as an exercise for the user to make a pd-vanilla implementation.
>
> just send the mtx-output of [pix_multiblob] to the object, and you will
> get nice lists for each blob, starting with the index of the blob
> (zero-based) and then comes the data.
> use [route] to filter the relevant blobs and [unpack] to access the data.
>
>
> >
> > In the archives I found a response to similar a question saying there was
> a
> > gem example with matrix and multiblob, but I can not seem to find it. Any
> > idea what and where this is?
> >
>
> there's an abstraction called [pix_blobtracker] which uses
> [pix_multiblob] and matrix operations to track blobs.
>
>
> >
> > Hope thats not too many questions. And is it easier for the list if I
> divide
> > questions up (for archive purposes perhaps)?
> >
>
> personally i would prefer separate threads for separate questions for
> starters. it always ends in confusion, but we could try to delay this...
>
>
> gmsdr
> IOhannes
>
> #N canvas 0 0 552 353 10;
> #X obj 153 163 mtx;
> #X msg 153 143 col;
> #X obj 153 123 t b a b;
> #X obj 153 208 list prepend;
> #X obj 153 184 t a b;
> #X obj 196 185 i;
> #X obj 225 187 + 1;
> #X msg 214 165 0;
> #X obj 153 97 inlet;
> #X obj 153 236 outlet;
> #X text 72 48 output thw rows of a matrix \, prepended with a (zero-based)
> index;
> #X text 50 265 depends on [iemmatrix];
> #X connect 0 0 4 0;
> #X connect 1 0 0 0;
> #X connect 2 0 1 0;
> #X connect 2 1 0 1;
> #X connect 2 2 7 0;
> #X connect 3 0 9 0;
> #X connect 4 0 3 0;
> #X connect 4 1 5 0;
> #X connect 5 0 6 0;
> #X connect 5 0 3 1;
> #X connect 6 0 5 1;
> #X connect 7 0 5 1;
> #X connect 8 0 2 0;
>
> #N canvas 166 277 450 419 10;
> #X msg 176 195 \$2;
> #X obj 184 249 repack;
> #X obj 144 221 list split 3;
> #X obj 184 321 list prepend;
> #X obj 144 170 t a a b;
> #X obj 184 274 t a b;
> #X obj 216 297 i;
> #X obj 246 298 + 1;
> #X msg 234 276 0;
> #X obj 144 145 inlet;
> #X obj 184 351 outlet;
> #X text 72 108 output thw rows of a matrix \, prepended with a (zero-based)
> index;
> #X text 50 375 depends on [zexy];
> #X connect 0 0 1 1;
> #X connect 1 0 5 0;
> #X connect 2 1 1 0;
> #X connect 3 0 10 0;
> #X connect 4 0 2 0;
> #X connect 4 1 0 0;
> #X connect 4 2 8 0;
> #X connect 5 0 3 0;
> #X connect 5 1 6 0;
> #X connect 6 0 7 0;
> #X connect 6 0 3 1;
> #X connect 7 0 6 1;
> #X connect 8 0 6 1;
> #X connect 9 0 4 0;
>
>
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