69 lines
1.6 KiB
Julia
69 lines
1.6 KiB
Julia
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using FileIO
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using Images, ImageView
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using Colors
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using Formatting
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using FFTW
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function idealFilter(r, isLow, threshold)
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if isLow
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r .<= threshold
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else
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r .> threshold
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end
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end
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function gaussianFilter(r, isLow, threshold)
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if isLow
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exp.(-(r.^2) ./ 2*(threshold^2))
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else
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1 .- exp.(-(r.^2) ./ 2*(threshold^2))
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end
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end
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function butterworthFilter(r, isLow, threshold, n)
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if isLow
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1 ./ (1 .+ (r ./ threshold) .^ (2 * n))
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else
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1 ./ (1 .+ (threshold ./ r) .^ (2 * n))
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end
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end
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function laplacianFilter(r, isLow, threshold)
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-r.^2
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end
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function filterFactory(name, shape, isLow, threshold, other)
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n, m = shape
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r = sqrt.([i^2 + j^2 for i=-n/2:n/2-1, j=-m/2:m/2-1])
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if name == "Ideal"
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idealFilter(r, isLow, threshold)
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elseif name == "Gaussian"
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gaussianFilter(r, isLow, threshold)
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elseif name == "Butterworth"
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butterworthFilter(r, isLow, threshold, other)
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elseif name == "Laplacian"
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laplacianFilter(r, isLow, threshold)
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else
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error("Filter not found")
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end
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end
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if abspath(PROGRAM_FILE) == @__FILE__
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imagePath = ARGS[1]
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filterName = ARGS[2]
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filterLow = ARGS[3] .== "true"
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filterThreshold = parse(UInt32, ARGS[4])
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filterOther = parse(UInt32, ARGS[5])
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img = load(imagePath)
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img_gray = Float32.(Gray.(img))
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filter = filterFactory(filterName, size(img_gray), filterLow, filterThreshold, filterOther)
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#= display(filter) =#
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#= println() =#
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img_fft = fftshift(fft(img_gray))
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out = abs.(real.(ifft(img_fft .* filter)))
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filename = format("filter_{}_{}_{}_{}.png", imagePath, filterName, filterLow, filterThreshold)
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save(filename, out)
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end
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