Fig. 1. PBRDF geometric relationship diagram

Fig. 2. Experimental flow chart

Fig. 3. UV polarization imaging detection system: (a) Appearance; (b) Top view

Fig. 4. Xenon light source: (a) Physical map; (b) Spot

Fig. 5. Fingerprint samples: (a)Glass mirror; (b) Metallic lacquered board; (c) Ceramic tile; (d) Plastic plate; (e) Convex paperboard; (f) Printing paper

Fig. 6. Sweat latent fingerprint polarization parameter analysis: (a) S₀ map; (b) S₁ map; (c) S₂ map; (d) E_x map; (e)E_x-E_y graph; (f)E_y map; (g) PDI map; (h) AOP map; (i) DOLP map

Fig. 7. Sweat latent fingerprint reflectance curve

Fig. 8. Polarization parameters of sweat latent fingerprints at multiple angles: (a) S₀ map; (b) S₁ map; (c) S₂ map; (d) E_xmap; (e)E_x-E_y map; (f) E_ymap; (g) PDI map; (h) AOP map; (i) DOLP map

Fig. 9. Polarization parameter variation under multi-band of sweat latent fingerprint: (a) S₀ map; (b) S₁ map; (c) S₂ map; (d) E_x map; (e)E_x-E_y map; (f) E_y graph; (g) PDI map; (h) AOP map; (i) DOLP map

Fig. 10. Polarization parameters of latent fingerprints of different guest materials: (a) S₀ map; (b) S₁ map; (c) S₂ map; (d) E_x map; (e) E_x-E_y map; (f) E_y map; (g) PDI map; (h) AOP map; (i) DOLP map