Figure 6.

Normalized temporal variance maps for different harmonic bands as follows: (a) 0–1 (b) 1–3 (c) 3– 6 (d) 6–10 (e) 10–15, and (f) 15–75. The amplification parameter is 10 and the other harmonics are attenuated to zero. The highest amplification achieved can be seen in the 1–3 harmonic band. This was as expected since this band encompasses the natural frequency of the heart beat, however, we can still see that there are contributions by the higher harmonics.