Phase Quantization

Phase values in an image are important. However, despite this, phase can be quantized very heavily with little perceptual loss. It can be quantized to a few as four levels, or even three. Quantizing to two levels still gives an image that can be interpreted.

using TestImages
using Images
using ImagePhaseCongruency

img = Float64.(restrict(testimage("mandril_gray")))

results = map((8, 4, 3, 2)) do nlevels
    out = quantizephase(img, nlevels)
    clamp01!(Gray.(out))
end
mosaic(results; nrow=1)

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