Spatio-Temporal Digital Signal Processing
for Focus Localization from array EEG
Method: Two independent and separable transformations are
applied to the spatio-temporal data samples:
The Spatial Laplacian (SL) , which measures the saptial sharpness of a
spatio-temporal sample with respect to the rest of the samples collected at the same time.
The Temporal Laplacian (TL), which measures the temporal sharpness of a
spatio-temporal sample with respect to data collected before and after, but in the same
The space-time images of these transformations are multiplied on a
point-to-point basis to obtain the Spatio-Temporal Laplacian (STL) field. In this field
only data samples that were sharp in both space and time are emphasized.
The STL Field is the product of the SL Filed and the TL Filed. In the STL Field only
data samples that are sharp in both space 7 Time are emphasized.
Method: Spatio-Temporal Laplacian (STL) Transformation