Fig. 3: Distribution of reconstructed signals by rPPG methods across different window sizes.

This figure presents a comparison of the signal distributions obtained from eight remote photoplethysmography (rPPG) methods, utilizing window sizes of 4, 8, and 12 s, respectively. Each panel illustrates how the labeled signals are reconstructed under the specified window size, providing insights into the variability and consistency of each rPPG method’s performance. In the leftmost figure, we have a total of 75 Excellent signals, 35 Acceptable signals, and 362 Unfit signals. In the central figure, we have a total of 125 Excellent signals, 74 Acceptable signals, and 273 Unfit signals. In the rightmost figure, we have a total of 143 Excellent signals, 85 Acceptable signals, and 245 Unfit signals.