Scheme of the Mueller matrix imaging polarimeter. D: diffuser. SF: Spectral filter. P: linear polarizer. LCR: liquid-crystal retarders. (a) Transmission geometry. (b) Reflection geometry. (c) Scheme of the micro-polarizers pattern on a macro-pixel of the polarization camera. (d) Spectra of the three LED sources with central wavelengths of 470 nm, 565 nm and 660 nm, and after being filtered by the corresponding spectral filter (SF). Pictures of the system in (e) the transmission configuration and (f) the reflection configuration.