Table 2.

Performance of different versions of PhysNet [29] on the OBF [41] dataset. Root mean square error (RMSE) in beats per minute (bpm) and Pearson correlation coefficient (R) were used as the evaluation metrics.

3D CNN-Based	LSTM Variant	BiLSTM Variant	ConvLSTM Variant
RMSE = 2.048, R = 0.989	RMSE = 3.139, R = 0.975	RMSE = 4.595, R = 0.945	RMSE = 2.937, R = 0.977