Daniel Victoria wrote: > I never used it but I believe there is an addon I.hist.match for histogram > matching
Yes, it's i.histo.match for grass70: <https://svn.geotools.org/grass/grass- addons/grass7/imagery/i.histo.match/i.histo.match.html> A related thread: <http://lists.osgeo.org/pipermail/grass-dev/2013-February/062157.html>. It works, with integer values and doesn't like the "." character in the name of the input raster maps (currently?). Note, however, histogram matching wont "work" always, i.e. wont bring always eye-pleasant results. Normalising observations (read pixel values) of different acquisitions (to a common reference) from the same sensor (as I understand in this case), depends on many things (the acquisition geometry itself, the illumination and atmospheric conditions at the time of the acquisition, and other parameters). It is however, in a sense, "required" if one needs to not only visually interpret a mosaic, but also in case of attempting to cluster/segment/classify an image(-mosaic). [rest deleted] Best, Nikos
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