A Novel Short-Time Fourier Transform-Based Fall Detection Algorithm Using 3-Axis Accelerations

Figure 3

Representative normalized power plots for ADLs: gait (a); sit-to-stand (b); stand-to-sit (c); and sit-to-lie (d). The vertical dashed line indicates the fall impact and the horizontal dashed-dot-line the threshold (i.e., 0.5).

(a)

(b)

(c)

(d)