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  • ARCHIVED DATA SETS

    IMAGE CLASSIFICATION WITH MORPHIAS 1 BETA
    Comparison of Morphias 1.1 and PCI Geomatica®
    Files: full sized files 1350 x 964, 8-bits grey, background-masked, contrast-stretched 60-220
    Classification parameters
    PCI: Isodata, Clus(max 20, est 16, min 12), convergence 0.01, sample 20%, seed diagonal
    Morphias: Kmeans, 12 clus, sample 10%, seed random
    Theme Maps harmonized in GraphicConverter 5.6.2X for Mac OS 10.4 www.lemkesoft.com

    ↑ PCI = 11 classes
    Full size indexed tiff: Marc_2366_original_PCI_map.tif


    ↑ Morphias = 9 classes
    Full size indexed tiff: Marc_2366_morphias_map.tif


    ↑ Morphias-PCI: The class match is excellent overall and argues that Morphias is already a good substitute for PCI. This is a difference map between Morphias and PCI (after median filtering to correct for some kerf errors).
    The purple class is a separate PCI class contained mostly within the orange class in Morphias.
    The blue class is a separate PCI class is contained mostly within the lite green class in Morphias.
    We compared some (not all) signals in CellKit as 2D histograms for these classes with the conclusion that PCI pushed the envelope a bit, while Morphias was conservative. Of course we restricted clusters to 12 and haven't given Morphias a fair test yet. We also haven't used mindis to assess separations. Maybe by the end of next week.
    Full size indexed tiff: Marc_2366_morphias-PCI_map.tif


    2D histogram of AGB (x axis red channel) vs GABA (y axis green channel) signals for the Morphias lite green class
    2D histogram of AGB (x axis red channel) vs GABA (y axis green channel) signals for the PCI lite green and blue classes with Morphias envelope. It seems that PCI was able to pick up the trough in signals between the modes
    2D histogram of AGB (x axis red channel) vs GABA (y axis green channel) signals for the Morphias orange class
    2D histogram of AGB (x axis red channel) vs GABA (y axis green channel) signals for the Morphias orange and purple classes with Morphias envelope. It seems that the Morphias outcome lumping all together is more defensible, although multiple modes are evident in the cluster.


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