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letter
. 2020 Jun 6;20(11):3238. doi: 10.3390/s20113238

Figure 4.

Figure 4

(a) The absolute error of the heart rate obtained by the empirical mode decomposition based method. (b) The absolute error of the heart rate obtained by our proposed method. (c) The absolute error of the respiratory rate obtained by the empirical mode decomposition based method. (d) The absolute error of the respiratory rate obtained by our proposed method.