[IGSTK-Users] Troubleshooting communication issue with Micron Tracker

[Chris Heath]

Andinet,

The problem stemmed from IEEE-1394 bus resets.  These can occur with  
cabling that is too long, repeaters that aren't quite up to spec, or  
just bad connections.  It seems the Bumblebee driver can't gracefully  
recover from this reset, which is why you have to manually reset the  
tracking.  There is an article from PtGrey here:  http://www.ptgrey.com/support/kb/index.asp?a=4&q=189&ST=freeze 
.

On the other hand, I was able to invoke an error event and create an  
observer to reset the camera when the error was happening.  Thank you  
for the help you provided and continue to provide.

Chris

On May 28, 2008, at 3:26 PM, Andinet Enquobahrie wrote:

> Chris,
>>
>> Secondly, could you clarify what you mean in that second paragraph  
>> by #567 (a.k.a. where do you think I should invoke that error event?)
>>
> Line # 567 in igstkMicronTracker.cxx
>>
>>
>> On May 21, 2008, at 2:51 PM, Andinet Enquobahrie wrote:
>>
>>> Hi Chris,
>>>
>>> "Error grabbing a frame" occurs when Cameras_GrabFrame method (MTC  
>>> library method)
>>> that is internally used by MCamera returns an error.  I personally  
>>> never had such type of problem
>>> once communication is established and tracking starts.   If the  
>>> problem persists, we should ask
>>> advice from Claron folks. Have you observed similar error with the  
>>> demo application that comes
>>> with the tracker or is it only your IGSTK-based application?
>>>
>>> Your next question is how to restart tracking whenever there is  
>>> such an error. You could invoke
>>> an error event right after #567 ( right after igstkLogMacro..)and  
>>> then setup an observer in your application
>>> that listens to this error event. Then, use ResetTracking method  
>>> as a callback to your observer.
>>>
>>> This might work as a short term solution. But w should definitely  
>>> troubleshoot why you are getting a
>>> the error after communication is established and tracking starts
>>>
>>> Let us know what you find out..
>>>
>>> -Andinet
>>>
>>>> Hello all,
>>>>
>>>> I have created a program based largely on the  
>>>> "OneViewAndTrackingNewUsingMicronTracker" example found in the  
>>>> Sandbox.  The program works great for  while, until it stops  
>>>> responding to input from the Claron.  The error given in the log  
>>>> is listed as:
>>>>
>>>> (CRITICAL) Error grabbing a frame
>>>>
>>>> It seems that once there is an error grabbing a frame, the  
>>>> communication fails completely, and I continually see the error  
>>>> over and over again and am no longer able to track (which seems  
>>>> to go against the point number 2 listed as a requirement for the  
>>>> communication object).
>>>>
>>>> If I turn tracking off then on again, tracking will resume for a  
>>>> while, until once again it fails in the same manner.
>>>>
>>>> The approach that I think may work in the short term, until I can  
>>>> figure out why this error pops up at all, is to create a method  
>>>> in my implementation.h file as follows:
>>>>
>>>> void ResetTracking()
>>>> {
>>>>   m_Tracker->RequestReset();
>>>>   m_Tracker->RequestStartTracking();
>>>> }
>>>>
>>>> I would want to call this method whenever the communication  
>>>> object reports an error grabbing a frame.  My question is, how  
>>>> could I access this error report?  I can see it in the logger, do  
>>>> I need to use the logger object to do so or will the  
>>>> communication object return an error code?  I would appreciate  
>>>> any advice.
>>>>
>>>> Thanks,
>>>> Chris
>>>> _______________________________________________
>>>> IGSTK-Users mailing list
>>>> IGSTK-Users at public.kitware.com
>>>> http://public.kitware.com/cgi-bin/mailman/listinfo/igstk-users
>>>>
>>>
>>>
>>> -- 
>>> ==========================================================
>>> Andinet A. Enquobahrie, PhD
>>> R&D Engineer
>>> Kitware Inc.
>>>
>>> 28 Corporate Drive
>>> Clifton Park, NY 12065-8662
>>> Phone: 518-371-3971 x124
>>> www.kitware.com
>>>
>>>
>>
>>
>
>
> -- 
> ==========================================================
> Andinet A. Enquobahrie, PhD
> R&D Engineer
> Kitware Inc.
>
> 28 Corporate Drive
> Clifton Park, NY 12065-8662
> Phone: 518-371-3971 x124
> www.kitware.com
>
>

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