Interesting question...had to think over about the definition....so I tried also wikipedia: @ https://en.wikipedia.org/wiki/Light_field... as well as
http://lightfield-forum.com/what-is-the-lightfield/ .
Perhaps one will find also further information at http://spectrum.ieee.org/consumer-electronics/gadgets/lightfield-photography-revolutionizes-imaging or also via the term light-field camera (cf. http://graphics.stanford.edu/papers/light/
The second part of your question ("FPM") perhaps is more difficult to answer (adding: I have to admit.: "especially if one isn't familiar with the whole technology.....but thanks for question about a fascinating area of research !) but it seems there are answers (=articles) to be found in the web / in Journals): e.g.:
L. Tian and L. Waller, "3D Fourier Ptychographic imaging from light field measurements in an LED array microscope," in Imaging and Applied Optics 2015, OSA Technical Digest (online) (Optical Society of America, 2015), paper CT3F.2.
https://www.osapublishing.org/abstract.cfm?URI=COSI-2015-CT3F.2 (unfortunately only PPV=pay-per-view)
or ZENG et al, 2014: Wide-field, high-resolution Fourier ptychographic microscopy @ https://arxiv.org/ftp/arxiv/papers/1405/1405.0226.pdf cf: Figure
2, p 13 and ff. in their publication:
Further help perhaps via [Google] web search e.g. for:
"light field imaging AND Fourier Ptychographic Microscopy" .
Hope to see some other reply (replies) to this really fascinating matter!
Good luck and best wishes!
Dear Kancharla Parimala, you're welcome. As I have seen most recently, there is another possibility to learn about, using the search function of RG: e.g. ==> https://www.researchgate.net/topic/light_field_imaging.
Searching in RG for or only yields this your question (for now). Best wishes !
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