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profile.cxx |

Find the gray value profile along the image diagonal by means of a vigra::LineIterator
Usage: `profile infile`, generates `profile.gif`

    /************************************************************************/
    /*                                                                      */
    /*               Copyright 1998-2002 by Ullrich Koethe                  */
    /*                                                                      */
    /*    This file is part of the VIGRA computer vision library.           */
    /*    The VIGRA Website is                                              */
    /*        http://hci.iwr.uni-heidelberg.de/vigra/                       */
    /*    Please direct questions, bug reports, and contributions to        */
    /*        ullrich.koethe@iwr.uni-heidelberg.de    or                    */
    /*        vigra@informatik.uni-hamburg.de                               */
    /*                                                                      */
    /*    Permission is hereby granted, free of charge, to any person       */
    /*    obtaining a copy of this software and associated documentation    */
    /*    files (the "Software"), to deal in the Software without           */
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    /*    sell copies of the Software, and to permit persons to whom the    */
    /*    Software is furnished to do so, subject to the following          */
    /*    conditions:                                                       */
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    /*    The above copyright notice and this permission notice shall be    */
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    /*    Software.                                                         */
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    /*    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND    */
    /*    EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES   */
    /*    OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND          */
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    /************************************************************************/

    #include <iostream>
    #include "vigra/stdimage.hxx"
    #include "vigra/imageiteratoradapter.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: " << vigra::impexListFormats() << ")" << std::endl;

            return 1;
        }

        try
        {
            vigra::ImageImportInfo info(argv[1]);

            vigra_precondition(info.isGrayscale(), "Sorry, cannot operate on color images");

            int w = info.width();
            int h = info.height();

            vigra::BImage in(w, h);
            importImage(info, destImage(in));

            int length = (w < h) ? h : w;

            // create output image of appropriate size
            vigra::BImage out(length, 256);

            // paint output image white
            out = 255;

            // create line iterator that iterates along the image diagonal
            vigra::LineIterator<vigra::BImage::Iterator> line(in.upperLeft(), in.lowerRight());

            // create line iterator that marks the end of iteration
            vigra::LineIterator<vigra::BImage::Iterator> end(in.lowerRight(), in.lowerRight());

            // create image iterator that points to the first pixel of the last
            // row of the destination image
            vigra::BImage::Iterator column = out.upperLeft() + vigra::Diff2D(0, 255);

            // iterate along the line and across the destination image
            for(; line != end; ++line, ++column.x)
            {
                vigra::BImage::Iterator row(column);
                // paint all pixels black whose coordinates are smaller than the
                // current gray value along the diagonal
                for(int y=0; y <= *line; ++y, --row.y)  *row = 0;
            }

            std::cout << "Writing profile.gif" << std::endl;
            exportImage(srcImageRange(out), vigra::ImageExportInfo("profile.gif"));
        }
        catch (vigra::StdException & e)
        {
            std::cout << e.what() << std::endl;
            return 1;
        }

        return 0;
    }

© Ullrich Köthe (ullrich.koethe@iwr.uni-heidelberg.de) Heidelberg Collaboratory for Image Processing, University of Heidelberg, Germany | html generated using doxygen and Python vigra 1.9.0 (Tue Nov 6 2012)