2D surface spline interpolation

Discussions
1

Dear all,
I am working on spatiotemporal mapping of 2D and 3D EEG data.
I want to develop the method of surface interpolation,
can anyone help me to develop this method?

I hope you will send me positive and helpful response.

Thanks a lot in advance!

Best,

ahmed

2

Hi Ahmed,

What do you mean by the “method of surface interpolation” ?
What is your starting point, what is your data, what kind of results are you trying to get, with what tools?

Cheers,
Francois

3

Hi Francois

the 2D surface spline InterpolatIon or the thin plate spline interpolation method is used to location of brain activity from EEG joint measures.

In fact, evoked potentials as electroencephalography not record the electrical activity of the scalp that specific points corresponding to the location of the electrodes. For a comprehensive representation of the potential distribution on the scalp, it is necessary to interpolate between these points. In order to display the EEG in a plane in the form of a map, we must, from the potential values ​​measured at the electrode positions, estimate the potential value for all pixels in the map. It took a while to develop interpolation algorithms to calculate the potential value for each pixel of the map. In this sense, several interpolation algorithms have been developed, better neighbors, thin plate spline, spherical splines …

Best,
Ahmed

4

Hi Ahmed,
There are some basic interpolation methods available in Brainstorm to display smooth MEG/EEG maps on a 2D or 3D surface, based on a Shepard method (weighted combination of K-nearest neighbors). You can find this in the function brainstorm3/toolbox/math/bst_shepards.m
For other methods, look on Matlab Central FileExchange or directly in the links at the bottom of the wikipedia page of the method you are interested in.
Francois

5

Hi Francois,
thank you for your reply
Best,
Ahmed