Visible and infrared DoFP images.  Visible DoFP images were taken by the North Guangwei UMC4A-PU0A Micro DoFP LWIR polarization imager, which consists of an array of wire-grid micro-polarizers, with a resolution of 640 × 512 and a 14 bits depth. Infrared DoFP images were taken by Daheng Imaging MER2-503-36U3M POL DoFP visible polarization imager, which employs a monochromatic quad-polarizer array at a resolution of 2448×2048, an 8 bits depth and a frame rate of 36 frames/s.