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. 2017 Dec 20;141(1):117–131. doi: 10.1093/brain/awx306

Figure 3.

Figure 3

Illustration of feature extraction procedure. (A–D) Fast activity extraction. (A) Original post-onset time-frequency plot. (B) Frangi filtering result. (C) Thresholding result. (D) Final morphological cleaning result. (E–H) Suppression extraction. (E) Original post-onset time-frequency plot with ideal suppression region. (F) Guided filtering result. (G) Fast activity-based spatial constraint. (H) Final thresholding result. (I–K) Preictal spikes extraction. (I) Original pre-onset time-frequency plot. (J) Median statistics for each time point. (K) Small circles indicate major local maxima as the spike candidates.