Monogenic filters

Phase congruency marks all classes of features from steps to lines and is a dimensionless quantity that ranges from 0 to 1. This allows fixed thresholds to be used over wide classes of images.

using TestImages
using Images
using ImagePhaseCongruency

img = restrict(testimage("mandril_gray"))

(pc, or, ft, T) = phasecongmono(img)
nonmax = Images.thin_edges(pc, or)

mosaic(
    img,
    adjust_histogram(pc, LinearStretching()),
    nonmax,
    hysthresh(nonmax, 0.1, 0.2);
    nrow=2, rowmajor=true
)

Images: 1) top left: original image 2) top right: phase congruency 3) bottom left: non-maximal suppression 4) bottom right: Hystersis thresholded

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