ITKMorphologicalContourInterpolation

[thomas-beznik]

Hello everyone,

I would like to use "ITKMorphologicalContourInterpolation" from ITK inside of the browser. Is it possible? I have followed the steps to install itk-js, but I can't find this class and I don't see what I should do... Any help would be greatly appreciated!

Best, Thomas

[thewtex]

Hello Thomas,

Yes, we will create an example.

Thanks, Matt

[thomas-beznik]

Hello,

Thank you for your answer!

Do you confirm that it is indeed possible to use this class using itk-js? Could you also give me a lead on how this could be done? I need this feature quite urgently and might need to go another direction if things don't evolve here, but I would really like to use this class.

Thank you for the help!

[thewtex]

Yes, @finetjul has used it in an application, but I do not know if has been made open source, yet.

[finetjul]

Sure, here is what we do:

#include <iostream>
#include "itkImageFileReader.h"
#include "itkImageFileWriter.h"

#include "itkMorphologicalContourInterpolator.h"

int main(int argc, char** argv) {

    if(argc != 3)
    {
        std::cout << "Usage: " << argv[0] << " <input> <output>" << std::endl;
        return EXIT_FAILURE;
    }

    const char * inputImageFile = argv[1];
    const char * outputImageFile = argv[2];

    using PixelType = unsigned short;
    constexpr unsigned int Dimension = 3;

    using ImageType = itk::Image<PixelType, Dimension>;
    using ReaderType = itk::ImageFileReader<ImageType>;
    auto reader = ReaderType::New();
    reader->SetFileName(argv[1]);

    using InterpolatorType = itk::MorphologicalContourInterpolator<ImageType>;
    auto interpolator = InterpolatorType::New();
    interpolator->SetInput(reader->GetOutput());

    // This filter fails with the default emscripten trap mode.
    // https://github.com/emscripten-core/emscripten/blob/906e14e4173e00b47ed931f993c837eb7c6f649a/site/source/docs/compiling/WebAssembly.rst#trap-mode

    using WriterType = itk::ImageFileWriter<ImageType>;
    auto writer = WriterType::New();
    writer->SetInput(interpolator->GetOutput());
    writer->SetFileName(argv[2]);
    try{
        writer->Update();
    }catch(itk::ExceptionObject & err){
        std::cerr << err << std::endl;
    }

    return EXIT_SUCCESS;
}

There are examples on itk.js to build with emscripten. You then add your WASM to webpack and use runPipelineBrowser to execute the program within JS.

[thewtex]

Sure, here is what we do:

@finetjul thanks!

// This filter fails with the default emscripten trap mode. https://github.com/emscripten-core/emscripten/blob/906e14e4173e00b47ed931f993c837eb7c6f649a/site/source/docs/compiling/WebAssembly.rst#trap-mode

Note -- we are fixing this by default with the next version of itk.js by adding the flag -s BINARYEN_TRAP_MODE=clamp.