Denoise

using TestImages
using Images
using ImageContrastAdjustment
using ImagePhaseCongruency

# Values in the range 0 to 1
img = centered(Gray.(restrict(testimage("lighthouse"))))[-127:128, -127:128]

# Add noise with standard deviation of 0.25
img .+= 0.25 * randn(size(img))

cleanimg = ppdenoise(img; nscale=6, norient=6, mult=2.5, minwavelength=2, sigmaonf=0.55, dthetaonsigma=1.0, k=3, softness=1.0)

mosaic(
    adjust_histogram(img, LinearStretching()),
    adjust_histogram(cleanimg, LinearStretching());
    nrow=1
)

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