boundarytensor.cxx

Measure boundary and corner strengths with the boundaryTensor(): boundarytensor.cxx
Usage: example_boundarytensor infile, creates boundarystrength.tif and cornerstrength.tif

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/*               Copyright 1998-2004 by Ullrich Koethe                  */
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#include <iostream>
#include <vigra/multi_array.hxx>
#include <vigra/tensorutilities.hxx>
#include <vigra/boundarytensor.hxx>
#include <vigra/impex.hxx>

using namespace vigra; 

int main(int argc, char ** argv)
{
    if(argc != 2)
    {
        std::cout << "Usage: " << argv[0] << " infile" << std::endl;
        std::cout << "(supported formats: " << impexListFormats() << ")" << std::endl;
        std::cout << "creates: boundarystrength.tif, cornerstrength.tif" << std::endl;
        
        return 1;
    }
    
    try
    {
        ImageImportInfo info(argv[1]);
        int w = info.width(), h = info.height();
        
        // create image of appropriate size for boundary tensor
        MultiArray<2, TinyVector<float, 3> > boundarytensor(w, h);
        
        // input scale of the bandpass to be used
        double scale;
        std::cout << "Operator scale ? ";
        std::cin >> scale;
        
        if(info.isGrayscale())
        {
            MultiArray<2, float> in(w, h);
            importImage(info, in);

            boundaryTensor(in, boundarytensor, scale);
        }
        else if(info.isColor())
        {
            MultiArray<2, RGBValue<float> > in(w, h);
            importImage(info, in);
            
            // calculate the boundary tensor for every channel and add the results
            MultiArray<2, TinyVector<float, 3> > bandtensor(w, h);
            for(int b=0; b<3; ++b)
            {
                boundaryTensor(in.bindElementChannel(b), bandtensor, scale);
                
                boundarytensor += bandtensor;
            }
        }
        else
        {
            std::cerr << "Sorry, can only operate on gray and color images.\n";
            return 1;
        }
        
        MultiArray<2, float> boundarystrength(w, h), cornerness(w, h);
        MultiArray<2, TinyVector<float, 2> > edgeness(w,h);
        
        // compute the total boundary strength in each pixel
        tensorTrace(boundarytensor, boundarystrength);
        
        // decompose the boundary strength into corner and edge parts (where edge part also contains an orientation)
        tensorToEdgeCorner(boundarytensor, edgeness, cornerness);

        exportImage(boundarystrength, ImageExportInfo("boundarystrength.tif").setPixelType("UINT8"));
        exportImage(cornerness, ImageExportInfo("cornerstrength.tif").setPixelType("UINT8"));
    }
    catch (std::exception & e)
    {
        std::cout << e.what() << std::endl;
        return 1;
    }
    
    return 0;
}