Table 5 Processing times for the maps and a selection of processing steps. The average time based on the calculation of one partitioned video segment is reported
From: Spatio-temporal and -spectral feature maps in photoplethysmography imaging and infrared thermography
Map/processing step | Time series [\(\upmu\)s] | Map 376 \(\times\) 232 [s] | Map 608 \(\times\) 448 [s] |
|---|---|---|---|
Mean intensity | 0.13 | 0.01 | 0.03 |
Band power | 0.03 | 0.00 | 0.01 |
Band mean power | 0.05 | 0.00 | 0.01 |
Band max/band power | 0.16 | 0.01 | 0.04 |
Spectral centroid | 0.56 | 0.05 | 0.15 |
Spectral spread | 1.37 | 0.12 | 0.37 |
Spectral skewness | 4.53 | 0.39 | 1.23 |
Spectral kurtosis | 1.82 | 0.16 | 0.50 |
Spectral crest | 0.19 | 0.02 | 0.05 |
Spectral flatness | 1.39 | 0.12 | 0.38 |
Spectral entropy | 1.73 | 0.15 | 0.47 |
Spectral slope | 0.98 | 0.09 | 0.27 |
Max frequency | 0.11 | 0.01 | 0.03 |
Phasor phase | 0.10 | 0.01 | 0.03 |
Phasor amp | 0.10 | 0.01 | 0.03 |
Temporal var | 5.24 | 0.46 | 1.43 |
Spectral flux pos | 1.27 | 0.11 | 0.35 |
Spectral flux neg | 1.27 | 0.11 | 0.35 |
Ratio flux pos | 1.45 | 0.13 | 0.39 |
Ratio flux neg | 1.45 | 0.13 | 0.39 |
PS | 19.01 | 1.66 | 5.18 |
Mean subtract | 0.13 | 0.01 | 0.04 |
Filter | 5.70 | 0.50 | 1.55 |
Windowing | 1.25 | 0.11 | 0.34 |
FFT | 10.41 | 0.91 | 2.84 |