[PD] pix_multiblob and matrix

[arno liegeon]

IOhannes m zmoelnig a écrit :
> arno liegeon wrote:
>  
>> Hello, I use pd-0.39.2-extended-test5 on a ibook G4 with Mac OsX 10.4. I
>> try to use "pix_multiblob" object but I don't know how find the valures
>> of others blobs than the first one. In reference, patch show a
>> "pd_showblob 1" only but I want others blobs.
>>     
>
> [pix_multiblob] outputs the data as a matrix as used by iemmatrix.
>
> the format is rather simple, as it is a message:
> "matrix <#r> <#c> <a_1_1> <a_1_2> ... <a_1_#c> <a_2_1> ... <a_#r_#c>"
>
> in short:
> "matrix 2 3 10 20 30 7 6 5"
> denotes a matrix 2x3 matrix:
>   10 20 30
>    7  6  5
>
> (btw, it is always a good idea to just inspect the actual message you
> want to understand with a [print], so you see the entire message)
>
> the number of cols of the matrix output by [pix_multiblob] is fixed (8
> iirc), the number of rows is variable and equals the number of detected
> blobs.
> so [pd showblob 1] just discards the selector "matrix" and the 1st 2
> values of the remaining list (the #rows & #cols) and unpacks the next 8
> elements; the rest is discarded.
>
> using iemmatrix will really help you a lot with the matrix-messages.
>
>  
>> Another problem is "pix_blobtracker" object are not running in my 
>> computer.
>>     
>
> [pix_blobtracker] uses iemmatrix for further processing; you need to
> have this library installed (and loaded) to make use of 
> [pix_blobtracker].
>
>  
>> Thanks for your lights and sorry to my poor english!
>>     
>
> probably it might be good to add an option to [pix_multiblob] which
> would output the data in a more simple (though less compact) format.
>
> mfg.asdr
> IOhannes
>
>  
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>>     
>
>
>   
Thanks for your answer but I don't know how I can use the matrix. I 
don't find any doc or help-file about matrix, mtx,... It is possible to 
send me a little code, for example the pix_multiblob-help.pd modified to 
recognize 2 blobs with their valures.
Thanks again.
Arno LIEGEON