Re: [Java-player-users] problems using blobfinder

[Radu B. R. <ru...@cs...>]

Hi Alberto,

The segmentation fault is on Player side. Hopefully v2.0 will not be 
that "picky" on this little details. :)

I am not sure if the Gazebo part (changing the tracked color on the fly) 
is implemented. I know for a fact that it works fine with a CMUcam2 
camera connected to Player, so it might be that the Gazebo driver is not 
supporting it properly.

I'll have a look at Stage today and report later.

Cheers,
Radu.

-- 
| Radu Bogdan Rusu | http://rbrusu.com/
| http://www9.cs.tum.edu/people/rusu/
| Intelligent Autonomous Systems
| Technische Universitaet Muenchen


Alberto Amengual wrote:

> Hi Radu,
>
> Thanks a lot, now it works. If you have a minute to briefly explain 
> the threading trick, that'd be great. Or maybe you can point me to 
> some doc.
>
> A couple of notes:
>
> * I had to do the request for the blobfinder interface in mode 'r', 
> mode 'a' causes a segmentation fault, so
> "BlobFinderInterface bfi = robot.requestInterfaceBlobfinder(0, 'r');"
>
> * I have tried to track a particular color, but it didn't work. For 
> example for orange:
> "bfi.setTrackingColor(255,255,128,128,0,0)" but the blobs are still 
> the same as without that line. I mean that's no big problem, then I 
> just have to go through the blobs and look for the orange one. 
> Probably that line is not enough, because on the client I get a "Need 
> to handle a EAR message", and on the server "PlayerQueue::Push(): 
> trying to push from non-allocated queue".
>
> Best,
>
> Alberto
>
>
> Radu Bogdan Rusu wrote:
>
>> Hello Alberto,
>>
>> Sorry for replying so late (hmm, looks like I'm the only one actually 
>> doing that on this mailing list :)). I just uploaded a basic 
>> Blobfinder example to the Javaclient examples web page. Maybe that 
>> will help.
>>
>> Please modify your source code according to the following guidelines, 
>> and try again:
>> - before the while (true), add a line like "robot.runThreaded (-1, -1);"
>> - remove the "bfi.readData();" from the main while loop;
>> - add a delay such as "try { Thread.sleep (100); } catch (Exception 
>> e) { }" in the main while loop.
>>
>> I don't know about Gazebo, but I will have a look.
>>
>> Best regards,
>> Radu.
>>
>
>
>
>
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