1. An adaptive filter for use in a coherent computed imaging system, comprising: a coherent adaptive prefilter comprising a plurality of fixed filters each having a predetermined filter width for producing a coherently filtered complex interferogram; a phase unwrapping circuit for unwrapping the phase of the coherently filtered complex interferogram; and an adaptive noncoherent complementary postfilter for performing a weighted combination of the phase-unwrapped, fixed-filtered interferograms using a predetermined data-dependent criterion function.