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95 lines
3.7 KiB
C++
95 lines
3.7 KiB
C++
/*
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#
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# File : fade_images.cpp
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# ( C++ source file )
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#
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# Description : Compute a linear fading between two images.
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# This file is a part of the CImg Library project.
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# ( http://cimg.eu )
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#
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# Copyright : David Tschumperlé
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# ( http://tschumperle.users.greyc.fr/ )
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#
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# License : CeCILL v2.0
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# ( http://www.cecill.info/licences/Licence_CeCILL_V2-en.html )
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#
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# This software is governed by the CeCILL license under French law and
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# abiding by the rules of distribution of free software. You can use,
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# modify and/ or redistribute the software under the terms of the CeCILL
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# license as circulated by CEA, CNRS and INRIA at the following URL
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# "http://www.cecill.info".
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#
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# As a counterpart to the access to the source code and rights to copy,
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# modify and redistribute granted by the license, users are provided only
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# with a limited warranty and the software's author, the holder of the
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# economic rights, and the successive licensors have only limited
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# liability.
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#
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# In this respect, the user's attention is drawn to the risks associated
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# with loading, using, modifying and/or developing or reproducing the
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# software by the user in light of its specific status of free software,
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# that may mean that it is complicated to manipulate, and that also
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# therefore means that it is reserved for developers and experienced
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# professionals having in-depth computer knowledge. Users are therefore
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# encouraged to load and test the software's suitability as regards their
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# requirements in conditions enabling the security of their systems and/or
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# data to be ensured and, more generally, to use and operate it in the
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# same conditions as regards security.
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#
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# The fact that you are presently reading this means that you have had
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# knowledge of the CeCILL license and that you accept its terms.
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#
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*/
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#include "CImg.h"
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#ifndef cimg_imagepath
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#define cimg_imagepath "img/"
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#endif
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#undef min
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#undef max
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// Main procedure
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//---------------
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int main(int argc,char **argv) {
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// Read and check command line parameters.
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cimg_usage("Compute a linear fading between two 2D images");
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const char *file_i1 = cimg_option("-i1",cimg_imagepath "sh0r.pgm","Input Image 1");
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const char *file_i2 = cimg_option("-i2",cimg_imagepath "milla.bmp","Input Image 2");
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const char *file_o = cimg_option("-o",(char*)0,"Output Image");
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const bool visu = cimg_option("-visu",true,"Visualization mode");
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const double pmin = cimg_option("-min",40.0,"Begin of the fade (in %)")/100.0;
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const double pmax = cimg_option("-max",60.0,"End of the fade (in %)")/100.0;
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const double angle = cimg_option("-angle",0.0,"Fade angle")*cil::cimg::PI/180;
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// Init images.
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cil::CImg<unsigned char> img1(file_i1), img2(file_i2);
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if (!img2.is_sameXYZC(img1)) {
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int
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dx = std::max(img1.width(),img2.width()),
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dy = std::max(img1.height(),img2.height()),
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dz = std::max(img1.depth(),img2.depth()),
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dv = std::max(img1.spectrum(),img2.spectrum());
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img1.resize(dx,dy,dz,dv,3);
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img2.resize(dx,dy,dz,dv,3);
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}
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cil::CImg<unsigned char> dest(img1);
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// Compute the faded image.
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const double ca = std::cos(angle), sa = std::sin(angle);
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double alpha;
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cimg_forXYZC(dest,x,y,z,k) {
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const double X = ((double)x/img1.width() - 0.5)*ca + ((double)y/img1.height() - 0.5)*sa;
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if (X + 0.5<pmin) alpha = 0; else {
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if (X + 0.5>pmax) alpha = 1; else
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alpha = (X + 0.5 - pmin)/(pmax - pmin);
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}
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dest(x,y,z,k) = (unsigned char)((1 - alpha)*img1(x,y,z,k) + alpha*img2(x,y,z,k));
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}
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// Save and exit
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if (file_o) dest.save(file_o);
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if (visu) dest.display("Image fading");
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return 0;
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}
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