Experimental Verification for Cable Force Estimation Using Handheld Shooting of Smartphones

Figure 8

Measurement using Smartphone 4: (a) displacement-time history (before moving average); (b) displacement-time history (after moving average); (c) first-order finite-difference of sums of pixel intensities in ROI; (d) corresponding PSD of (b).

(a)

(b)

(c)

(d)