Supplemental Material Variable Aperture Light Field Photography: Overcoming the Diffraction-limited Spatio-angular Resolution Tradeoff

1. Additional Details for Wigner PSFs The Wigner Distribution Function (WDF) is a joint representation of space and spatial frequency. It can be considered as the local frequency spectrum of the signal [2]. Spatial frequencies are linked to the direction of propagation θ of light rays as u = sin θ λ . Hence, the WDF is sometimes also referred to as the ray spread function. It has been explored in the context of physical optics [3, 1, 2] and also geometric optics or light fields [9, 7]. The effect of an aperture with transmittance t(ν) on an incident WDF corresponds to the transformation of the WDF at the aperture plane: Wo (ν, u) = 1 2π ∫ Wt (ν, u− ui)Wi (ν, ui) dui, (1)