OpenViBE forum

Welcome on board, The Question is: Does anyone know if the OpenVibe software works in a Linux Embedded System? I'm not very familiar with Linux Embedded but it seems unlikely. OpenViBE is compatible officially or not with ubuntu, fedora, mint... But it requires a whole set of dependencies (look at l...

Hi, The Reference channel box substracts the value received on the reference to the other channels. This is useful with some EEG devices. The reference is usually placed on a spot where only the noise remains (e.g. on the nose). Doing so will remove the acquired noise on the other channels to get a ...

Hi Qasem, 1) I have a bad result (I not got any correct choice at all). and some times I got 79% classifier result. The classifiers behind the P300 speller are choosing if a specific row or column is "P300" positive, among 6. The random limit is thus 5/6 = 83%. So 76% at estimation on the k-fold tes...

Hi Lorena, The Graz visualization is a simple yet quite useful tool. You can also look at the handball scenario . It's a bit old now, but it makes use of the same signal processing scheme. The online mode can be used with the handball application, a small 3d world were the motor imagery of the hands...

Hi Dieter, We saw that you added the 2 debug messages, the first one being already in the original source code. For the record, the 3 dates printed are ( stim date : stim date + offset : stim date + offset + duration ) [ INF ] At time 9.906 sec <Box algorithm::Stimulation based epoching> Created new...

Hi there, Sorry, the team is a bit reduced with everyone's summer vacation. I'm still not capable of reproducing this problem on any computer here :s Meanwhile, you can deactivate Ogre so that openvibe won't even try to load it. You will lost the 3D visualization though. In your local configuration ...

Hi Lorena, The GUI files are .ui Gtk files (written in an XML format). They are located in the share folders of the projects. For example, the Designer GUI is in openvibe-applications/designer/share . These files can be read by glade . They are uses as a basis for the GUI, but many things are done i...

Hi karthiks, Indeed it fails in the middle of the Ogre startup process, but without any error message. If we compare your log to a clean one, it seems like Ogre fails to load its plugins, starting with OpenGL Renderer. Do you have a local version of Ogre installed on your computer (maybe it could me...

Hi khartiks, The next step after loading all the plugins (vrpn is the last loaded) should be the designer re-opening the latest scenario(s) used. These scenarios are defined in the generated file openvibe-designer.conf in C:\document and settings\[login]\ . You can remove this file, maybe it's someh...

Hi bob,

The topographic maps use interpolation to compute a value for each area of the map.
Different interpolation methods exist, here we use Spline interpolation.

Laurent

Hi Antonio, The openvibe Emotiv driver currently accesses only the EEG and the gyroscope sensors. The Affectiv suite of the SDK is not used at all, but I assume it could be. As we are usually only processing raw EEG data when we use the Emotiv headset, we won't develop this feature anytime soon. How...

Hi Antonio, Is it possible to capture the same emotional dimensions through OpenVibe? We don't know what is the signal processing pipeline behind this "emotion detection" claimed by Emotiv. In my opinion it may be EEG, EMG (muscular activity of the face) or a combination of both activities. I'm not ...

Hi karthiks, I forgot to tell you something... When adding a new dependency we also add its DLL folder to the windows PATH variable, so openvibe can find every DLL it needs. This is done by the script win32-init_env_command.cmd . This file has also been updated with the pthread dependency. Please de...

As for the classifier processor, I forgot something... I'm afraid that SVM can be trained with multi-class but the processor does not handle more than 2 classes at the moment. You cannot add a third "class label" setting in the box. We don't use 3 class classifiers, so it was not implemented when th...

Hi KB88, I would like to create a BCI scenario (hands/feet movement) with three classes (Right/Left/Forward). The lua file must produce a random set of trials, i.e. a random set of triplets, using [OVTK_GDF_Right, OVTK_GDF_Left, OVTK_GDF_Up]. The Graz visualization box is able to display the instruc...