Table 3 Processing chain parameters used for the chain given in Fig. 2
From: Spatio-temporal and -spectral feature maps in photoplethysmography imaging and infrared thermography
Preprocessing | |||
|---|---|---|---|
Method linear interpolation | |||
\(N_{\text {samples}}\) all |
ROI generation | |||
|---|---|---|---|
| Â | PPGI | Â | IRT |
Spatial pooling | |||
Filter | Â | Â | Â |
Type | Â | Gaussian | Â |
\(\sigma _\text {gauss}\) | 10 | Â | 5 |
\(N_\text {kernel}\) | 41 | Â | 33 |
Decimation | |||
\(d_\text {x}\) | 5 | Â | 1 |
\(d_\text {y}\) | 5 | Â | 1 |
\(b_\text {center}\) | Â | True | Â |
Temporal filtering | |||
|---|---|---|---|
\(T_\text {seg}\) | 10 | ||
\(N_\text {seg}\) | 250 | ||
Filter | |||
Type | IIR | ||
Design | Butterworth | ||
\(N_\text {order,design}\) | 6 | ||
\(b_\text {zero-phase}\) | True | ||
\(f_{\frac{1}{2}\text {,low,baby}}\) | 0.80 Hz | ||
\(f_{\frac{1}{2}\text {,high,adult}}\) | 5 Hz | ||
\(f_{\frac{1}{2}\text {,low,baby}}\) | 1.30 Hz | ||
\(f_{\frac{1}{2}\text {,high,adult}}\) | 5 Hz | ||
Feature generation | |||
|---|---|---|---|
Window | |||
Type | Hann | ||
\(N_\text {win}\) | 250 | ||
\(N_\text {overlap}\) | 249 | ||
\(N_\text {FFT}\) | 1024 | ||
\(b_\text {zero-pad}\) | True | ||
\(f_{\text {FFT low, adult}}\) | 0.85 Hz (\(\approx\)50bpm) | ||
\(f_{\text {FFT high, adult}}\) | 3.98 Hz (\(\approx\)240bpm) | ||
\(N_{\text {band, adult}}\) | 129 | ||
\(f_{\text {FFT low, baby}}\) | 1.51 Hz (\(\approx\)90bpm) | ||
\(f_{\text {FFT high, baby}}\) | 3.66 Hz (\(\approx\)220bpm) | ||
\(N_{\text {band, baby}}\) | 89 | ||
Postprocessing | |||
|---|---|---|---|
Histogram intersection | |||
\(N_{\text {scale}}\) | 256 | ||
\(N_{\text {bins}}\) | 256 | ||
\(N_{\text {kernel,hist}}\) | 31 | ||
Padding | Symmetric | ||