Feature Extraction and Classification of EEG Signals. The Use of a Genetic Algorithm for an Application on Alertness Prediction - Guide to Brain-Computer Music Interfacing - page 196

Fig. 9.11 Representation of
the dyadic grid with 4 levels
of decomposition (4 scales)

Time

Signal
points

Fig. 9.12 A signal generated
with the toolbox FracLab
( Top ). The dyadic grid,
containing the absolute value
of the discrete wavelet
coefficients of the signal
( Bottom ). The large
coefficients are in red and the
smallest values in blue