Courtesy of E. Longo, LOA
A plenoptic camera is composed of a main lens, a microlens array and a detector. It is equivalent to combine a main lens with a wavefront sensor. In the figure, the sample is composed of two corks distant of 9 cm.
After re-arranging the pixels from the raw plenoptic image, each sub-image corresponds to a different point of view on the scene as illustrated by these two squares.
Digital refocusing can be performed after the image was taken. From the raw plenoptic image (, we could refocused either on the first cork with « Au Château» written on it or on the 2nd one, located 9cm behind.