Fig. 5From: Fog computing application of cyber-physical models of IoT devices with symbolic approximation algorithmsA pictorial diagram of symbolic Fourier approximation (SFA) procedure: a Incoming sensor data of six time-series, b The data is then transformed via Fourier transform, c The Fourier coefficients are quantized via Multiple Coefficient Binning (MCB), and d Each time series has been mapped into its respective SFA wordBack to article page