A spectrum analyzer for producing a first two-dimensional array of time varying spectral analysis image input signals, a reference image generator for producing a second two-dimensional array of spectral analysis image reference signals, and a time-integrative correlator, which can be non-coherent or...http://www.google.de/patents/US6163378?utm_source=gb-gplus-sharePatent US6163378 - Spectroscopic time integrative correlation for rapid medical diagnostic and universal image analysis
