Figure 6
From: Dynamic Metasurface Aperture as Smart Around-the-Corner Motion Detector
Detecting purely periodic motion and estimating its period, based on intensity-only data from M = 150 random DMA masks. (a) Angular displacement of Object 1 over a test interval, color-coded as shown in the legend. Aperiodicity is introduced once through random motion of Object 2 while Object 1 moves periodically and once by adding noise to the exact positions of Object 1 required for periodic motion (cf. Fig. 1). (b) The bandpass filtered quantity U filt , processed from the measurement matrix W as discussed in the main text (cf. Eq. 6), used to extract the desired information. (c) The raw estimate T R (t) of the motion’s periodicity. (d) The linear correlation coefficient R described in the main text, that confirms purely periodic motion detected in (c) if it is very close to unity. (e) The combined overall results, showing excellent agreement both in terms of distinguishing pure periodicity from no motion or aperiodicity as well as estimating the period.
