After forming an interferogram, phase filtering and phase unwrapping. The interferogram is geocoded. Now, how can I extract displacement information from the produced interferogram?
I am not sure, that I have got the question correctly or not. But I think you can use image correlation technique to extract speckle displacements from the interferometric images. you can see the attached paper that we have extracted and built the object shape using speckle displacements.
Dear Reda,
your question is very general. I could recommend you the book
Handbook of Optical Dimensional Metrology
Kevin Harding
Taylor & Francis 2013Print ISBN: 978-1-4398-5481-5
eBook ISBN: 978-1-4398-5482-2
where you may go to
Chapter 4. Displacement Measuring Interferometry
Vivek G. Badami, Peter J. de Groot.
I wish you success,
Elena Stoykova
Yep. Plus "geocoding is not easy to understand, to me al least. In general each fringe corresponds to half wavelength of optical path difference, but the measurement geometry and setup can play relevant roles in this
I mean after forming an interferogram
how it can be used to derive the terrain displacement in Radar LOS " line of sight " direction.
Digital holography or interferometry enables the access to the complex amplitude (real amplitude and phase) of a wave field. If we recorded two holograms, one for the initial state and another after applying a loadmaster, one can then reconstruct two phase distributions which correspond to the initial and deformed states. Thus, one has all information needed to produce interferometric fringes of the difference or sum of displacements.
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