SnapUnlock: A Contrastive Learning-Based Contactless Authentication via Heterogeneous Sensors

Figure 4

The PSD correlation coefficients of volunteer A in different sessions.

(a) The PSD correlation coefficients of sound

(b) The PSD correlation coefficients of accelerometer in axis

(c) The PSD correlation coefficients of accelerometer in axis

(d) The PSD correlation coefficients of accelerometer in axis