Image Binarization

[ashwani-rathee]

• Supposed to provide demonstrations and examples for ImageBinarization.jl

Status : Early Stage, Not Ready

Preview Link :

Knowingly/unknowingly, current version does show http related methods and metaprogramming support usage here which might be a good thing.

Notes:

• To binarize a brain scan(.nii)(3d image), needs to be figured out
• ImageMagick.load loses a lot of detail this way of url download

using HTTP, ImageMagick

function get_image(url)
    response = HTTP.get(url)
    buffer = IOBuffer(response.body)
    img = ImageMagick.load(buffer)
end
# This returns a very bad image for some reason

Better method to download images

using Images
function get_image(url)
    img = mktemp() do fn, f
        download(url, fn)
        load(fn)
    end
    img_resized = imresize(img, ratio = 1 / 2)
end

img_coins = get_image("https://i.imgur.com/91IOKtJ.png")

[johnnychen94]

I was expecting this demo to provide more information than https://zygmuntszpak.github.io/ImageBinarization.jl/dev/. But it turns out that it only
changes the input image?

The idea of solving sudoku sounds a great case to me but I didn't find the package OCReact

[johnnychen94]

What's the advantage of this compared to

algs = [AdaptiveThreshold(), Balanced(), Entropy(), Intermodes(),
        MinimumError(), Moments(), Niblack(), Otsu(),
        Polysegment(), Sauvola(), UnimodalRosin(), Yen()]
outs = map(alg->binarize(img, alg), algs)

?

[ashwani-rathee]

I didn't know we could make array of functions like this. Suggested version would be more concise then..

[johnnychen94]

I can't find OCReact.jl in JuliaHub and GitHub.

[ashwani-rathee]

https://github.com/leferrad/OCReract.jl extra r issue

[johnnychen94]

I think we should use https://github.com/pixel27/Tesseract.jl instead because it's backed by Tesseract_jll

[ashwani-rathee]

OCReract.jl is better maintained I think, no updates in Tesseract.jl in last 15 months. But https://github.com/JuliaPackaging/Yggdrasil shows that Tesseract folder was updated in past 12 days. I don't know enough binary builds, so we can go for Tesseract.jl if you think that's a better option

[johnnychen94]

OCReract.jl is better maintained I think

Nope, OCReract.jl requires the user to manually install Tesseract and make it available in PATH. While Tesseract.jl ships a prebuilt Tesseract using BinaryBuilder so that user just need pkg> add Tesseract and that's all.

[ashwani-rathee]

Actually, there isn't much to add with what I know. I think we can add the build histogram(with its graph) and show the threshold..But it would require me to use plots here, which might slow things more I think

[johnnychen94]

I'm a little bit concerned about the current version because it adds basically nothing new compared to the existing index page of ImageBinarizations. The API itself is quite simple to understand and use.

I feel we need some application that uses ImageBinarization as a part of its pipeline. The sudoku solver sounds interesting, fingerprint enhancement together with ImageMorphology seems also a good candidate. How do you think?