Is the reflected light polarized?
Yes, all reflections are partially polarized. Especially, when the camera is at the special angle (so called Brewster angle), the reflected light is perfectly linear polarized. Is the the scene polarized? No, the scene is not polarized. Although the scene is unpolarized, the reflected light off the wall is pertially polarized.
Is this superior than using specular wall?
Our method always improves the performance for all reflection parameters of the wall. You can compbine our polarization technique to other techniques including putting a partial occluder and using specular wall material.
Isn’t the observation dark?
Despite the low light efficiency due to light cut off at the polarizer, the polarization cues can improve the conditioning. This is a suprising finding.