java-player-users

[Java-player-users] Blobfinder

[Nils O. T. <no...@gm...>]

I'm using the blobfinder in stage at the moment and have the problem 
that, if no blob is in sight, I still get one data set with the 
following values (taken form a debug message in my program)

1 Blob(s) found from player0 with the following attributes: (Size of the 
picture is 22648x5)
Blob 0 has its centre at (0/6339)

Anyone else experiences the same problem? I know that the other 
libraries have problems with that as well, there was a discussion about 
it in the c++ library recently with the title "blobfinder acting funny"

regards,
Nils Ole Tippenhauer
-- 
Exchange Research Student @PAMI lab
U. of Waterloo, Ontario, Canada

Re: [Java-player-users] Blobfinder

[Nils O. T. <no...@gm...>]

I checked with a real robot and the problem doesn't seem to appear 
there. maybe its just the stage implementation of blobfinder then?

regards,
Nils Ole Tippenhauer
-- 
Exchange Research Student @PAMI lab
U. of Waterloo, Ontario, Canada


Nils Ole Tippenhauer wrote:
> I'm using the blobfinder in stage at the moment and have the problem 
> that, if no blob is in sight, I still get one data set with the 
> following values (taken form a debug message in my program)
> 
> 1 Blob(s) found from player0 with the following attributes: (Size of the 
> picture is 22648x5)
> Blob 0 has its centre at (0/6339)
> 
> Anyone else experiences the same problem? I know that the other 
> libraries have problems with that as well, there was a discussion about 
> it in the c++ library recently with the title "blobfinder acting funny"
> 
> regards,
> Nils Ole Tippenhauer

Re: [Java-player-users] Blobfinder

[Radu B. R. <ve...@in...>]

Yup, I'm quite sure it's Stage, since the BlobfinderInterface works well 
with the CMUcam2. I'll try to have a look at Stage and see if I can 
submit a patch really quick.

Cheers,
Radu.

Nils Ole Tippenhauer wrote:

> I checked with a real robot and the problem doesn't seem to appear 
> there. maybe its just the stage implementation of blobfinder then?
>
> regards,
> Nils Ole Tippenhauer


-- 

Yours sincerely,
Radu Bogdan Rusu
--
| Radu Bogdan 'veedee' Rusu | http://www.rbrusu.com
| PhD student/researcher
| Robotics Research Group, Faculty of Automation & Computer Science
| Technical University of Cluj-Napoca[.ro]

Re: [Java-player-users] Blobfinder

[Nils O. T. <no...@gm...>]

Hi Radu,
Thanks for looking into that, I implemented a workaround like this in my 
program:
if (blobfinder.getBlobCount()>0 && blobfinder.getImageWidth()<2000) {
	//blob found
	}
else {
	//no blob|false blob found
}
because the fake blob always comes with a crazy ImageWidth, for me at 
least (22648x5). If thats the case for everyone a line like that in 
Stage could probably help as well :)

regards,
Nils Ole Tippenhauer
-- 
Exchange Research Student @PAMI lab
U. of Waterloo, Ontario, Canada



Radu Bogdan Rusu wrote:
> Yup, I'm quite sure it's Stage, since the BlobfinderInterface works well 
> with the CMUcam2. I'll try to have a look at Stage and see if I can 
> submit a patch really quick.
> 
> Cheers,
> Radu.
> 
> Nils Ole Tippenhauer wrote:
> 
>> I checked with a real robot and the problem doesn't seem to appear 
>> there. maybe its just the stage implementation of blobfinder then?
>>
>> regards,
>> Nils Ole Tippenhauer
> 
> 
>