How to choose the coefficients for a Surface LaPlacian filter (spatial filter)?

hackr · September 2017

I'm trying to read up on the Surface LaPlacian filter/transform to better understand what this is all about. However, if someone wants to explain what I need to know to continue learning OpenViBE that would be greatly appreciated

In the OpenViBE classification examples, they have this spatial filter labeled LaPlacian Surface. It takes 2 coefficients for every 1 input channel as parameters. I am wondering how one goes about determining what coefficients to use.

Paski · September 2017

Hi Hackr, see this link. There you will find the coefficients. https://www.bci2000.org/mediawiki/index.php/User_Tutorial:Configuring_Online_Feedback

La placian filter is a filter where you give some wight to the channels. It is usually used for Motor imagery. the channels of interest is C3 and C4 (right / left movements).

hackr · September 2017

@Paski Thanks for the link. I guess I'm trying to better understand the logic for determining the coefficients that they use. That way, I can understand how to change their values to try to improve my performance.

How to choose the coefficients for a Surface LaPlacian filter (spatial filter)?

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