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

Figure 3

The PSD curve of sound and motion data for volunteers A and B in different sessions.

(a) The PSD of sound for volunteer A

(b) The PSD of accelerometer in axis for volunteer A

(c) The PSD of accelerometer in axis for volunteer A

(d) The PSD of accelerometer in axis for volunteer A

(e) The PSD of sound for volunteer B

(f) The PSD of accelerometer in axis for volunteer B

(g) The PSD of accelerometer in axis for volunteer B

(h) The PSD of accelerometer in axis for volunteer Z