Fig. 6From: A novel method for the detection of R-peaks in ECG based on K-Nearest Neighbors and Particle Swarm OptimizationResults after performing each stage of the method for the ECG with numerous long time cardiac arrest in duration (ECG recording 232). a) Original signal. b) Filtering. c) Differentiation. d) Absolute value. e) Backward cumulation. f) Detected peaksBack to article page