Search found 780 matches

by jtlindgren
Thu Jul 12, 2018 6:59 am
Forum: Discussion about BCI and related topics
Topic: Imagination detection right hand and left hand
Replies: 1
Views: 1989

Re: Imagination detection right hand and left hand

Hello Fabio, I'm not sure if the electrode configuration is optimal for motor imagery. Do you have any other electrodes near C3 and C4? It'd be best if you could have some electrodes also around C3 and C4 for CSP to be able to build a Laplacian type center-surround configurations to better isolate t...
by jtlindgren
Thu Jul 12, 2018 6:54 am
Forum: Boxes
Topic: can't make the Classifier Accuracy Measure work
Replies: 3
Views: 1731

Re: can't make the Classifier Accuracy Measure work

Hi, that box is unfortunately broken in the release version of OpenViBE. I recently fixed it, but we haven't made a new release. If its very important to you, you can try to compile the latest git master version where it should be ok.


Best,
Jussi
by jtlindgren
Fri Jul 06, 2018 8:12 am
Forum: Discussion about OpenViBE
Topic: Csv Writer Box was updating fine and suddenly do not anymore
Replies: 1
Views: 2665

Re: Csv Writer Box was updating fine and suddenly do not any

Hi, here's some pointers. If you think the issue is in your scenario, please see http://openvibe.inria.fr/tutorial-troubleshooting-openvibe-scenarios/ On the other hand, if you think it is a bug, please follow the instructions in http://openvibe.inria.fr/faq/#how-to-report-a-bug/ Personally I'm not ...
by jtlindgren
Thu Jul 05, 2018 7:38 am
Forum: Scenarios and BCI design
Topic: Cognitive state recognition based on raw EEG data
Replies: 1
Views: 1495

Re: Cognitive state recognition based on raw EEG data

Hi, openvibe does not have premade classifiers for different mental states or conditions, as according to mainstream understanding, the signal processing (classifier) requires changes for different conditions as well (or to figure them out automatically -- hard). For example, the change of user, use...
by jtlindgren
Mon Jul 02, 2018 1:53 pm
Forum: Scenarios and BCI design
Topic: Running MANY files through CSP/classifier training
Replies: 1
Views: 1227

Re: Running MANY files through CSP/classifier training

Hi, its not super comfy, but what you can do is to have some external process launch designer multiple times with different configurations. For this you can use Matlab, Python, R or even a shell script if you're comfy with it. Basically, you should loop over your electrode configurations with a bloc...
by jtlindgren
Mon Jul 02, 2018 8:49 am
Forum: Boxes
Topic: Windowing and Time Based Epoching
Replies: 4
Views: 1827

Re: Windowing and Time Based Epoching

In OV, signal is always implicitly epoched even if you're not aware of it: the data is always passed on from box to another in small matrix chunks. In OV, the 'epoch size' and 'chunk size' are the same thing, and mean the number of columns in small data matrices that are passed around. For example, ...
by jtlindgren
Mon Jul 02, 2018 7:46 am
Forum: Boxes
Topic: Windowing and Time Based Epoching
Replies: 4
Views: 1827

Re: Windowing and Time Based Epoching

Hi, Epoching slices the signal in different ways (you can think of it as implementing a sliding window with different step sizes), whereas Windowing applies a coefficient mask on each signal chunk. Both names are due to historical reasons. If you have single channel signal chunk [x(1),...,x(k)] for ...
by jtlindgren
Wed Jun 27, 2018 7:41 am
Forum: Tutorial scenarios
Topic: tutorial to use openvibe source code
Replies: 1
Views: 890

Re: tutorial to use openvibe source code

Hello, not at the moment, no. If you wish to integrate openvibe-based scenario playing (DSP) to your program, you could look at the scenario player code under the sdk/. This player doesn't have any GUI, so it should be more easy to understand than the designer code. Getting signal acquisition integr...
by jtlindgren
Wed Jun 27, 2018 7:36 am
Forum: Tutorial scenarios
Topic: Cannot find power and time display
Replies: 2
Views: 2017

Re: Cannot find power and time display

Hi, some boxes had to be dropped/replaced in the OpenViBE 2.x, and we don't currently have the resources to update the video. You can either try OpenViBE 1.3 or use other boxes. The following document lists the changes, http://openvibe.inria.fr/differences-between-1-x-and-2-x-series-of-openvibe/ You...
by jtlindgren
Thu Jun 21, 2018 10:59 am
Forum: Help for building the software
Topic: Windows 10 - ninja: error: loading 'build.ninja' : No
Replies: 18
Views: 10320

Re: Windows 10 - ninja: error: loading 'build.ninja' : No

I'm often building it on Windows 10 myself so it should work. Some colleagues do as well. I'm not sure what could be the issue if the VS version etc are as they should be. On my computer the lib is present in several different places, e.g. under "Program Files (x86)", ./Microsoft SDKs/Windows/v7.1A/...
by jtlindgren
Thu Jun 21, 2018 8:25 am
Forum: Acquisition server and drivers
Topic: LSL driver: does OpenViBE support non-integer sampling freq.
Replies: 2
Views: 1290

Re: LSL driver: does OpenViBE support non-integer sampling f

Hello Stanislav, unfortunately non-integer sampling rates are not currently supported. In this case it might be best to modify the LSL driver to drop an extra sample now and then to get to an integer rate. This is because if you want to mark your EEG with events in OpenViBE (e.g. for training classi...
by jtlindgren
Wed Jun 20, 2018 8:29 am
Forum: Discussion about OpenViBE
Topic: Controlling a nes game with openvibe
Replies: 2
Views: 1793

Re: Controlling a nes game with openvibe

Hi, sure, you just need to forward 'classifier processor' outputs to the NES emulator using some communication protocol of your choice (see the ov web documentation); you can look at the motor imagery scenarios how the left/right detection works. The challenge is twofold: 1) code the reception of th...
by jtlindgren
Wed Jun 20, 2018 7:59 am
Forum: Help for building the software
Topic: Windows 10 - ninja: error: loading 'build.ninja' : No
Replies: 18
Views: 10320

Re: Windows 10 - ninja: error: loading 'build.ninja' : No

Hi Luke, the 'clearest' indicator there about the reason of the fail is that the 'gdi32.lib' seems to be missing. Could it be this problem: https://stackoverflow.com/questions/33599723/fatal-error-lnk1104-cannot-open-file-gdi32-lib/47175728 Since we generate everything by cmake we cannot directly ap...
by jtlindgren
Tue Jun 19, 2018 7:04 am
Forum: Box and application development
Topic: Terminal log file
Replies: 1
Views: 1360

Re: Terminal log file

Hello, this depends on the operating system, on windows the log file location is C:\users\yourname\appdata\roaming\openvibe-version and on linux .config/openvibe-version/ The log you're interested in should be called openvibe-designer.log, but some other files there might be sometimes useful too. Ch...
by jtlindgren
Fri Jun 08, 2018 12:53 pm
Forum: OpenViBE News
Topic: Job offer: EEG headset mechatronics engineer
Replies: 0
Views: 5482

Job offer: EEG headset mechatronics engineer

Dear all,

Maureen Clerc's group at Nice area, France, has a position open on EEG headset design. Likely it will also involve working on a P300 speller that uses OpenViBE as its signal processing backend.

Please see the attached file for more details.

Cheers,
Jussi