Research Article

Novel Signal Noise Reduction Method through Cluster Analysis, Applied to Photoplethysmography

Figure 6

Comparison between clustering and nonclustering for a variety of inputs. (a) Simulated movement artefacts, (b) simulated electrical noise, (c) simulated electrical artefact and movement noise, (d) no noise, and (e) white noise as an input. Note that in (c) and (e) a cluster of sufficient size was not formed; therefore the algorithm reported no result.
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