Georgiev T, Lumsdaine A, Chunev G
IEEE Comput Graph Appl. 2011 Jan-Feb;31(1):62-73. doi: 10.1109/MCG.2011.12.
This approach uses a focused plenoptic camera to capture the plenoptic function's rich "non 3D" structure. It employs two techniques. The first simultaneously captures multiple exposures (or other aspects) based on a microlens array having an interleaved set of different filters. The second places multiple filters at the main lens aperture.