Fig. 2
From: Fusion of detected multi-channel maternal electrocardiogram (ECG) R-wave peak locations
Illustration of voting. The red circles refer to the detected maternal R-wave peak locations. a The initial maternal R-wave detection results of the four-channel signals; b the results after projecting the initial detection results on the same axis; c cluster results for all locations; d remaining classes after removing error classes; e final detection results after back projecting the remaining classes to the real four-channel signals