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PostPosted: Fri Nov 06, 2009 10:07 am 
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Joined: Sun Oct 25, 2009 1:18 am
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Hi there,

Can anyone please explain to me what is the difference between these two terms? The articles online always refer to them but I'm finding it difficult to get my head around it.

How do you get from raweeg signal (coming from serial port) to Dataset (used for for processing in software)?

Please help!!!

Bayo


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PostPosted: Fri Nov 13, 2009 9:58 am 
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Joined: Fri Sep 01, 2006 3:39 pm
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Hello Bayo,

I'm not sure about exact terminlogy but if I add to make a difference, I would say that datasets have raw eeg plus some labels telling for example what the subject's cerebral activity is expected to be. For example for left / right hand movements, during the first phase (acquisition of data), the user is presented some instructions telling him to imagine left or right hand movements... the file that is saved during this session has synchronized stimulations along the signal telling if the user is actually having a rest, imagining left hand movement or imagining right hand movement. Later you can train algorithms such as classifiers based on these labels.

Does it help ?

Yann


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PostPosted: Mon Nov 16, 2009 11:36 pm 
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Hi Yann,

Thanks for your help. I think I have an idea what it means now? by the way does anyone know if MATLAB can be used for realtime processing of EEG signal? I'm trying to use Matlab in conjuction with Open vibe.
Also, is it possible to send signals from openvibe to Matlab?


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PostPosted: Tue Nov 17, 2009 9:01 am 
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bayo,

there is a first version of MATLAB box that actually forwards some OpenViBE data to MATLAB and takes back the processed data... If you are interested, please join us on the IRC channel so I can discuss this with you ! I would be happy to help and get your feedback !

Yann


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PostPosted: Tue Nov 17, 2009 8:59 pm 
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Joined: Sun Oct 25, 2009 1:18 am
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Hi Yann,

Thanks for your help. What is the IRC channel? Sorry I'm kind of new here.
Also, my openvibe does not seem to be able to save any scenario or box-configuration file. I created and saved a scenario but the file does not seem to appear in the folder I saved it. Also I tried creating a simple configuration file for the "temporal filter" but same thing happens. I couldn't save the existing one so I can modify it and save it as another file.
Is this a known bug? please help

Regards

Bayo


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PostPosted: Wed Nov 18, 2009 9:01 am 
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Joined: Wed Oct 07, 2009 12:11 pm
Posts: 417
Hi Bayo,

I may help you on this one, so my colleague Yann doesn't do all the job here ;)
IRC is a protocol used for chatting with people. You connect to a IRC server, then you go in 1 or more channels. A channel is like a room were people can talk.
go here --> http://webchat.freenode.net/
Choose a nickname, then put #openvibe in the "channel" field, and connect. Ask for help there, you should see us on the channel.

For your problem with scenario saving, it's weird... I tried save/load a new scenario, and it works fine with the 2 last versions (openvibe compiled from sources, and openvibe from the installer).

When you try to save/load a file, do you see any error in the console ?
You should have
"[ INF ] Exporting scenario ... "
when saving or
"[ INF ] Importing scenario ... "
when loading

Regards,

Laurent

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Follow us on twitter >> openvibebci

Checkout my (old) blog for some OpenViBE tips & tricks : here !


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PostPosted: Wed Nov 18, 2009 9:49 am 
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Joined: Wed Oct 07, 2009 12:11 pm
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Hi again,

Yann just told me that there is indeed a known bug with the save/load on windows.
This bug occurs when the path and/or name of the file you try to save to or load contains non-ascii characters (such as é, à, ï, etc.).
Please avoid any accentuated character in your file name.

Regards,

Laurent-

_________________
Follow us on twitter >> openvibebci

Checkout my (old) blog for some OpenViBE tips & tricks : here !


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