1. A system, comprising: at least one processor; and a memory comprising program instructions that are executable by the at least one processor to: obtain a radiance image of a scene captured with a lens-based radiance camera comprising an array of refracting microlenses, the radiance image including optically mixed different spatial and angular frequency components; demultiplex the radiance image in the frequency domain to generate multiple parallax views of the scene by the program instructions further executable to: apply a Fourier transform to the radiance image to generate a transformed radiance image; extract multiple slices of the transformed radiance image each at a different angular frequency; apply the Fourier transform to each of the multiple slices of the transformed radiance image to generate an intermediate image from each of the multiple slices; stack the intermediate images to form a 3-dimensional image; apply the Fourier transform along an angular dimension of the 3-dimensional image to generate a transformed 3-dimensional image; and unstack the transformed 3-dimensional image to obtain the multiple parallax views of the scene.