  By placing a diffractive element in front of an image sensor, we are able to
multiplex the spectral and angular information of a scene onto the image
sensor. Reconstruction of the angular-spectral distribution is attained by
first calibrating the angular-spectral response of the system and then,
applying optimization-based matrix inversion. In our proof-of-concept
demonstration, we imaged the 1D angle and the spectrum with resolutions of
0.15o and 6nm, respectively. The information is reconstructed from a single
frame, thereby enabling snapshot functionality for video-rate imaging.
