Denoising Method Based on Sparse Representation for WFT Signal

Figure 7

Comparison of the denoising performance for simulation WFT signal with SNR = 5 dB.

(a) Noise-free signal

(b) Noisy signal with SNR = 5 dB

(c) Result of hard threshold

(d) Absolute error from hard threshold

(e) Result of soft threshold

(f) Absolute error from soft threshold

(g) Result of the proposed method

(h) Absolute error from proposed method