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c++image-processingdiplibvigra

DIPlib: Converting a dip::Image object to a vigra::MultiArrayView object with dip_vigra::DipToVigra not working

I am facing some trouble when I try to convert from a dip::Image object to a vigra::MultiArrayView. The way vice versa works fine, but when I try to call dip_Vigra::DipToVigra I am getting:

error: no matching function for call to ‘DipToVigra(dip::Image&)

How should I do this conversion?

As said, the way vice versa works fine with dip_vigra::VigraToDip()

vigra::FImage Img;
Img.resize(width, height);
vigra::MultiArrayView<2, float> VigraView = Img;
dip::Image DIPimage;

DIPimage = dip_vigra::VigraToDip(VigraView); // works fine

VigraView = dip_vigra::DipToVigra(DIPimage); // fails

I am working on opensuse using code::blocks as IDE.

Solution

  • Because dip::Image has properties (dimensionality and pixel type) defined at runtime, and vigra::MultiArrayView has properties defined at compile time through template parameters, the templated function dip_vigra::DipToVigra() needs explicit template parameters for the compiler to know what the output type is.

    That is, the compiler can automatically determine template parameters for dip_vigra::VigraToDip(), but not for dip_vigra::DipToVigra().

    So you need to explicitly mention these parameters:

    VigraView = dip_vigra::DipToVigra<2, float>(DIPimage);

    Note that, at runtime, the function will check that the properties of DIPimage match the given template parameters, and error out if they don't.

    The repository has an example C++ program that shows how to convert images between DIPlib and Vigra: https://github.com/DIPlib/diplib/blob/master/examples/external_interfaces/vigra_with_dip.cpp