Symmetric monogenic filters

Phase symmetry responds well to line like features and circular objects. The number of filter scales will affect the scale of features that are marked. Phase symmetry marks features independently of contrast (a bright circle is not more symmetric than a grey circle) and is a dimensionless quantity between 0 and 1. However this may not be what one desires in which case the symmetry energy may be of greater interest.

using TestImages
using Images
using ImagePhaseCongruency

img = Gray.(testimage("blobs"))
# Detect regions of bright symmetry (polarity = 1)
phase_bright, = phasesymmono(img; nscale=5, polarity=1)

# Detect regions of dark symmetry (polarity = -1)
phase_dark, = phasesymmono(img; nscale=5, polarity=-1)

mosaic(img, phase_bright, phase_dark; nrow=1)

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