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Illustration of denoising effects of the 3 × 4 tactile sensors of a subject. (a). Butterworth [19]; (b). wavelet [20]; (c). Empirical Mode Decomposition (EMD) [22]; (d). Variational Mode Decomposition (VMD) [24]; (e). Moving Average (MA) [26]; (f). Robust Principal Component Analysis (RPCA) [27]; (g). Weighted Principal Component Analysis (WRPCA) [28]; (h). Cross-Channel Dynamic Weighting Principal Component Analysis (cc-DWRPCA) [13]. All input pulse signals are normalized.
