Cycling 74 » Topic: Using blob tracking to draw shapes http://cycling74.com/forums/topic/using-blob-tracking-to-draw-shapes/feed Wed, 19 Jun 2013 15:57:46 +0000 http://bbpress.org/?v=2.2.4 http://cycling74.com/forums/topic/using-blob-tracking-to-draw-shapes/#post-51905 <![CDATA[Using blob tracking to draw shapes]]> http://cycling74.com/forums/topic/using-blob-tracking-to-draw-shapes/#post-51905 Sat, 21 Aug 2010 06:47:45 +0000 kodamapixel I should probably preface this by saying I’m stuck in the world of ‘trial and error’ at the moment – I’m not totally sure if I’m on the right track, so any suggestions at all are gratefully appreciated…

I’m trying to find a way to use cv.jit.blobs to create shapes – probably with OpenGL, which I’ve had some success with. The catch is that I don’t want to use a perfectly round or square (like cv.jit.bounds) shape – I’d prefer that it fitted the area considered a blob a little closer.

I’ve been playing with vade’s v001.posterize filter, to try and ‘crush’ the number of colour values into something similar, but because I need to make this a binary image for cv.jit anyway, it isn’t making a great deal of difference. The closest I’ve got is using cv.jit.blobs.color, but I’m hoping to create a more abstract shape with OpenGL than the coloured areas in a jitter matrix.

Hopefully this all makes some sense, but if not, here is the patch I’ve been testing some different cv.jit.blobs styles on…

– Pasted Max Patch, click to expand. –
]]> http://cycling74.com/forums/topic/using-blob-tracking-to-draw-shapes/#post-186269 <![CDATA[Re: Using blob tracking to draw shapes]]> http://cycling74.com/forums/topic/using-blob-tracking-to-draw-shapes/#post-186269 Sun, 22 Aug 2010 12:42:22 +0000 kodamapixel Just giving this a bit of a nudge by way of another patch – my last post was probably too general anyway.

Basically, what I'm trying to work out is how to take a video feed, crush the colours so I'm left with only a few distinct shades of grey (so that identifying different brightnesses is easier) and loosely tracing those shapes with OpenGL.

Attached is a photoshopped image of the 'crushed colour' effect I'm expecting would make shape tracking easier. The left and right side show before and after, respectively.

What I'm really stuck on now is how to separate each shade, so that I can work with them individually.

The attached image should work with this patch…

– Pasted Max Patch, click to expand. –

[attachment=139463,997]

]]> http://cycling74.com/forums/topic/using-blob-tracking-to-draw-shapes/#post-186270 <![CDATA[Re: Using blob tracking to draw shapes]]> http://cycling74.com/forums/topic/using-blob-tracking-to-draw-shapes/#post-186270 Mon, 23 Aug 2010 17:01:38 +0000 Rob Ramirez i believe jit.charmap is your friend in producing the “crushed colors” effect.

]]> http://cycling74.com/forums/topic/using-blob-tracking-to-draw-shapes/#post-186271 <![CDATA[Re: Using blob tracking to draw shapes]]> http://cycling74.com/forums/topic/using-blob-tracking-to-draw-shapes/#post-186271 Tue, 24 Aug 2010 04:40:56 +0000 kodamapixel Thanks very (very, very) much for the nudge in the right direction, robtherich. jit.charmap did indeed do the trick…

– Pasted Max Patch, click to expand. –

…now I just need to get those cv.jit.features values to draw some shapes for me!

]]> http://cycling74.com/forums/topic/using-blob-tracking-to-draw-shapes/#post-186272 <![CDATA[Re: Using blob tracking to draw shapes]]> http://cycling74.com/forums/topic/using-blob-tracking-to-draw-shapes/#post-186272 Tue, 24 Aug 2010 15:39:08 +0000 Rob Ramirez your question is still quite broad, if you get no further response i suggest you simplify/specify your question, perhaps breaking it into parts and reposting to forum.

]]> http://cycling74.com/forums/topic/using-blob-tracking-to-draw-shapes/#post-186273 <![CDATA[Re: Using blob tracking to draw shapes]]> http://cycling74.com/forums/topic/using-blob-tracking-to-draw-shapes/#post-186273 Wed, 25 Aug 2010 04:30:25 +0000 kodamapixel You’re right robtherich – sorry about that. So jit.charmap took care of finding the edges I was after, which I then used with cv.jit.features to find coordinates. What I’m trying to figure out is how to use these coordinates to draw a shape with OpenGL.

I realise that the points I’m getting from cv.jit.features aren’t ordered to give me a sequential perimeter of the shape, but I don’t seem to be getting any output at all in jit.gl.sketch.

I’ve checked over my OpenGL syntax many times, but I’m still not sure where the output is falling down…

– Pasted Max Patch, click to expand. –
]]> http://cycling74.com/forums/topic/using-blob-tracking-to-draw-shapes/#post-186274 <![CDATA[Re: Using blob tracking to draw shapes]]> http://cycling74.com/forums/topic/using-blob-tracking-to-draw-shapes/#post-186274 Wed, 25 Aug 2010 05:21:06 +0000 kodamapixel I’ve actually just gotten to the bottom of this: jit.gl.sketch wasn’t happy with the format of the message being passed to it – sending it through a message first sort it out.

]]> http://cycling74.com/forums/topic/using-blob-tracking-to-draw-shapes/#post-186275 <![CDATA[Re: Using blob tracking to draw shapes]]> http://cycling74.com/forums/topic/using-blob-tracking-to-draw-shapes/#post-186275 Sat, 11 Jun 2011 01:03:30 +0000 Zachrkn Kodamapixel, or anyone else that understands what his last post meant, would you mind explaining? In what way did you reformat the message such that jit.gl.sketch could handle it?

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