[PD] opencv motion tracker external HELP!

Mike Wozniewski mike at mikewoz.com
Wed May 30 23:24:10 CEST 2007

Yeah, I took the openCV blobtrack code from the examples and modified it 
just slightly. I didn't document all the changes, because it was never 
meant to last for more than one project. I simply added the pd netsend 
stuff, added a few sliders to control parameters, added an automatic 
background model refresher, and blacked out some areas of the image that 
I didn't want processed.

Attached is the patch that I use to receive the blob data in Pd (also 
with some customizations).


Nose Hair wrote:
> Sorry forgot to ask.  Do you have a pd abstraction for this? If not I 
> will see what I can cook up. I think iemmatrix might do the trick.
> Alain
> On May 29, 2007, at 8:08 PM, Nose Hair wrote:
>> I see you have the ability to capture from an avi built in already:
>> avi_name = argv[i];
>> if (avi_name) pCap = cvCaptureFromFile(avi_name);
>> else pCap = cvCaptureFromCAM( 0 )
>> This is code looks great.  I could figure it out from the code but if 
>> you have any use instructions let me know. It would be great to get a 
>> gui for this thing.  I will try to figure that out.
>> Thank you,
>> Alain
>> On May 29, 2007, at 6:58 PM, Nose Hair wrote:
>>> Thanks Mike,
>>> Its awsome how helpful people in this community can be.  I will check  
>>> out you code and modify it if need be, like add the option to use an  
>>> avi in order to be able to calibrate things and such and I will post  
>>> it.  I will also continue to figure out the external because I think  
>>> that would be a neater approach and cause I dont accept defeat very  
>>> easily.
>>> Alain
>>> On May 29, 2007, at 4:55 PM, Mike Wozniewski wrote:
>>>> Hi Alain,
>>>> I've used the OpenCV blobtracker with Pd before, and I simply send  
>>>> blob positions and sizes over UDP using u_pdsend.c
>>>> I've attached my code and makefile... look in blobtrack.c and  
>>>> search for where I use the pdsend_init() and pdsend_message()  
>>>> functions... it's pretty simple.
>>>> Then you just use [netreceive] in Pd and parse the list as you deem  
>>>> necessary.
>>>> Hope this helps,
>>>> -Mike
>>>> P.S. my blobtracker code is meant for use with a live camera, not  
>>>> with .avi files.
>>>> <blobTracker.tar.gz>
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