Processing 1.0 - Processing Discourse - flob / computer vision library

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flob / computer vision library (Read 7171 times)

flob / computer vision library
Feb 10^th, 2009, 11:07pm

hi

i built a simple multi-blob detector library, been using it in some projects, got a chance to clean it up and post it for others to use. my aims for this code were making it fast and lightweight. the library is still very early alpha, but already quite usable, hence i thought it should be useful for other people too.

it's called flob: a concatenation of flood and blob. the base algorithm is the flood-fill technique. i built a simple example which explains most the inner workings, available in the download.

here is the link
http://s373.net/code/flob

hope you enjoy.
best regards
a

as YaBB Newbies Offline Posts: 30	Re: flob / computer vision library Reply #1 - Feb 16^th, 2009, 6:07pm some updates: - returns normalized positions - support for non-square images - new om: continuous_difference - return pixelcount/mass of each blob - returns normalized presence

Re: flob / computer vision library
Reply #2 - Jun 23^rd, 2009, 4:21pm

hi everyone,

i've updated the flob library, more robust, stable and powerfull.
flob is a fast flood-fill multi-blob detector that works in processing.
tracks blobs and simple features in image streams.

now can track blobs with id's, track feature points, new version (001k) not backwards compatible, but simpler to access and use blob data.

have a look at the monoflob example, which emulates a camera based kind of monome. this code has been tested already on many mac's and windows and even linuxes, runs ok.

feedback this thread if you like it or have problems with it. hope you enjoy, a

http://s373.net/code/flob

jeffg Senior Member Offline Posts: 472	Re: flob / computer vision library Reply #3 - Jun 24^th, 2009, 7:20am cool

mariana YaBB Newbies Offline Posts: 3	Re: flob / computer vision library Reply #4 - Sep 18^th, 2009, 1:34am Hi I try to download the flob/computer vision library Until now I ‘v worked with the blob detection library, but I need Tracking und yours updates are really good, than I want to tray it wtht flob … but my browser cannot find your link Can you help me? thanks! Regards mariana

mariana YaBB Newbies Offline Posts: 3	Re: flob / computer vision library Reply #5 - Sep 20^th, 2009, 1:17pm cool! I have it now

sumit.pandey YaBB Newbies Offline Posts: 3	Re: flob / computer vision library Reply #6 - Dec 2^nd, 2009, 1:06am hey as! great library. thinking of linking it to tiction to generate movement based sound.im really curious to see how you did it but i cant make too much sense of java. can you share the algorithm or processing code you wrote?

Re: flob / computer vision library
Reply #7 - Dec 2^nd, 2009, 3:03am

hi

sure i share the sound sketch, glad you enjoy the lib.
i've been using 2 strategies, 1 sending via osc to max/pd/of...
and the other having sound straight out of java...

i just have an extended monoflob sketch which uses sound samples.. since the sketch is a bit lenghty to post, i though i just leave here the code you could insert in monoflob to make it work.

// main sketch changes
import ddf.minim.*;
...
Minim minim;
String audiofiles[] = {"1.wav","2.wav","3.wav","4.wav","5.wav"};
...
void stop(){ minim.stop();super.stop();}
...

// monoflob changes

// Botao b[];
BotaoAudio b[];

//and a new class...

// o botao audio tem tudo o q o botao normal tem,
// mas vai ter mais a parte de gerir audio

class BotaoAudio extends Botao{

float vol;
AudioPlayer sndplayer;

BotaoAudio(int i, float _x, float _y, float _w , float _h ){
super(i,_x,_y,_w,_h); //construtor botao normal

//carregar audio, converter o id para nome do ficheiro
sndplayer= minim.loadFile(audiofiles[i%5], 2048);
sndplayer.loop();
}

// overloading state to handle sound here
void state(){

super.state();// first calc state from botao, then use vars to scale audio amp
float newvol = map(gain, 0, 100, -50, 10); // os vols minim estão em dbs de -100 a 0
float f = 0.12; //lowpass para suavizar..
vol = f*newvol+(1f-f)*vol;
sndplayer.setGain(vol);
}

}

hope this gets you going...

as YaBB Newbies Offline Posts: 30	Re: flob / computer vision library Reply #8 - Feb 10^th, 2010, 6:58am another update to flob. more info here: http://s373.net/continuum/?p=216 best regards a

liquid Junior Member Offline Posts: 72	Re: flob / computer vision library Reply #9 - Feb 11^th, 2010, 7:47am as wrote on Feb 10^th, 2010, 6:58am: another update to flob. more info here: http://s373.net/continuum/?p=216 best regards a the download link seems broken,any chance to fix it thank you

as YaBB Newbies Offline Posts: 30	Re: flob / computer vision library Reply #10 - Feb 11^th, 2010, 8:10am oops. sorry, fixed already. edit: direct link for this version is http://s373.net/code/flob/flob-001o-20100210.tar.gz

manzanaextasis YaBB Newbies Offline Posts: 1	Re: flob / computer vision library Reply #11 - Feb 16^th, 2010, 1:13pm Any thoughts on using a movie file, rather than a camera, as input for flob? I thought it might just be a matter of changing the various instances of the video variable referencing the Capture class (and instead using Movie), but I'm not getting it to work.

Re: flob / computer vision library
Reply #12 - Mar 19^th, 2010, 5:29am

sorry, only today found your post. flob was not working with movies because they are not reporting their width and height accordingly. ie, println(myMovie.width+" "+myMovie.height); returns 1 1 on my system. this causes flob to not construct properly. a couple of days ago i put a version where you can use a different flob constructor, like:
flob = new Flob(this, srcWidth, srcHeight, dstWidth, dstHeight);
this makes it possible to use movies the standard way, like using cameras. also a bug with the abscence of the great fastblur has vanished.

hth

a

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