[PD] opencv motion tracker external HELP!

nosehair911 at bellsouth.net nosehair911 at bellsouth.net
Tue May 29 15:42:23 CEST 2007

Thanks for helping.  Well I basically have a rough sketch of all the objects but I am having a tough 
time with the outlet system.  In a nutshell opencv uses an image structure called "typedef struct 
_IplImage."  Acording to them "The structure IplImage came from Intel Image Processing Library 
where the format is native."  I can give you more information about it if you need it.  My problem is 
sending the result from IplImage to an outlet and being able to receive it from an inlet.  So far that is 
my bigest hurdle.  I have this code:

IplImage *frame = 0;

x->x_outlet = outlet_new(&x->x_obj, &s_anything);
outlet_anything(x->x_outlet, frame);

Obviously with more stuff in the middle but I keep getting this error from the compiler:

error: cannot convert IplImage* to t_symbol for argument 2 to "void outlet_anything(_outlet*, 
t_symbol*, int, t_atom*)

I still havent figured a way around this.  I am sure its easy but... Anyway Im trying to figure out the 
outlet first before I tackle the inlet.  Any advise?
> From: Tim Boykett <tim at timesup.org>
> Date: 2007/05/29 Tue AM 05:18:54 EDT
> To: <nosehair911 at bellsouth.net> <nosehair911 at bellsouth.net>
> Subject: Re:  opencv motion tracker external HELP!
> Hi Alain,
> how is this coming along? I gather that you got the tracker working
> as a standalone, but no luck with the external yet. Is that right?
> I would be interested in perhaps helping, but I thought I would check to
> see what was already working.
> cheers,
> tim
> On 27/05/2007, at 10:35 PM, <nosehair911 at bellsouth.net>  
> <nosehair911 at bellsouth.net> wrote:
> > For the last 2 weeks I have been trying to write a motion tracking  
> > external using the blob motion
> > tracker in opencv.  I had success with writing a program that  
> > recieves a path to an avi and motion
> > tracks the blobs and prints their position.  Now I am writing the  
> > set of Pd externals using the same
> > code with very little success. I need someone that knows what they  
> > are doing to look at my Pd code
> > and show me what I am doing wrong.  I have read and followed  
> > IOhannes guide on external writing.
> > Also, I have looked at the zexy and pdp sorce code in order to  
> > learn but still I am not getting it to work.
> > The externals are based on the already working code I was able to  
> > frankenstein together.  I am
> > calling it FTIR_Tools.  It consist of the following (if I ever get  
> > them to work!):
> >
> > 1. FTIR_Cam: detects webcam and sends out frames to outlet.
> > 2. FTIR_VPlayer: reads quicktimes from path and sends out frames to  
> > outlet.
> > 3. FTIR_Tracker: tracks blobs, sends out "matrix blob# position" to  
> > outlet2 and frames to outlet 1.
> > you can also turn on and off visuals for center point and bounding  
> > box.
> > 4. FTIR_Window: displays frames in an X11 window.
> >
> > Please look at my code and show me how to fix it. I am getting  
> > nowhere.  In the cvBloblib.zip is the
> > program I put together called Tracker and the code called  
> > Tracker.cpp.  If you want to see how it
> > works drag it to terminal and follow it with a path to an .avi. You  
> > must have opencv and fink installed.
> > If you have ploblems installing opencv post and I will be glad to  
> > help.
> > Thanks,
> > Alain
> > <FTIR_Tools(src).zip>
> > <cvBloblib.zip>
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