Fig. 1. (a) Schematic of the experimental setup; (b) PSA equipped by digital camera; (c) PSA equipped by polarization camera

Fig. 2. Color image and DOLP image of the sample under different incident angles and different polarizations

Fig. 3. Mixture experiment of the iron, aluminum, copper, and sediments, robber, cotton materials

Fig. 4. Changes of reflected DOLP and AOP of light from the surfaces of the copper, iron and aluminum material, versus the incident angle of illuminating light

Fig. 5. Polarization imaging for three medal samples: copper, iron and aluminum. (a) DOLP images; (b) AOP images; (c) QandUdot map