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/*
#
# File : wavelet_atrous.cpp
# ( C++ source file )
#
# Description : Performs a 2D or 3D 'a trous' wavelet transform
# (using a cubic spline) on an image or a video sequence.
# This file is a part of the CImg Library project.
# ( http://cimg.eu )
#
# Author : Renaud Peteri
# ( Renaud.Peteri(at)mines-paris.org )
# Andrea Onofri
# ( Andrea.Onofri(at)teletu.it )
#
# Institution : CWI, Amsterdam
#
# Date : February 2005
#
# References : Starck, J.-L., Murtagh, F. and Bijaoui, A.,
# Image Processing and Data Analysis: The Multiscale Approach,
# Cambridge University Press, 1998.
# (Hardback and softback, ISBN 0-521-59084-1 and 0-521-59914-8.)
#
# License : CeCILL v2.0
# ( http://www.cecill.info/licences/Licence_CeCILL_V2-en.html )
#
# This software is governed by the CeCILL license under French law and
# abiding by the rules of distribution of free software. You can use,
# modify and/ or redistribute the software under the terms of the CeCILL
# license as circulated by CEA, CNRS and INRIA at the following URL
# "http://www.cecill.info".
#
# As a counterpart to the access to the source code and rights to copy,
# modify and redistribute granted by the license, users are provided only
# with a limited warranty and the software's author, the holder of the
# economic rights, and the successive licensors have only limited
# liability.
#
# In this respect, the user's attention is drawn to the risks associated
# with loading, using, modifying and/or developing or reproducing the
# software by the user in light of its specific status of free software,
# that may mean that it is complicated to manipulate, and that also
# therefore means that it is reserved for developers and experienced
# professionals having in-depth computer knowledge. Users are therefore
# encouraged to load and test the software's suitability as regards their
# requirements in conditions enabling the security of their systems and/or
# data to be ensured and, more generally, to use and operate it in the
# same conditions as regards security.
#
# The fact that you are presently reading this means that you have had
# knowledge of the CeCILL license and that you accept its terms.
#
*/
#include "CImg.h"
using namespace cimg_library;
#ifndef cimg_imagepath
#define cimg_imagepath "img/"
#endif
// Define convolution mask.
CImg<float> mask(const unsigned char dirIdx, const unsigned char scale) {
const int
d1 = 1 << (scale-1),
d2 = 1 << scale,
c = d2,
vecLen = (1 << (scale + 1)) + 1;
const float
valC = 0.375f, // 6/16
valD1 = 0.25f, // 4/16
valD2 = 0.0625f; // 1/16
switch(dirIdx) {
case 0 : { // x
CImg<float> m(vecLen,1,1,1,0);
m(c) = valC;
m(c - d1) = m(c + d1) = valD1;
m(c - d2) = m(c + d2) = valD2;
return m;
}
case 1: { // y
CImg<float> m(1,vecLen,1,1,0);
m(0,c) = valC;
m(0,c - d1) = m(0,c + d1) = valD1;
m(0,c - d2) = m(0,c + d2) = valD2;
return m;
}
case 2: { // t
CImg<float> m(1,1,vecLen,1,0);
m(0,0,c) = valC;
m(0,0,c - d1) = m(0,0,c + d1) = valD1;
m(0,0,c - d2) = m(0,0,c + d2) = valD2;
return m;
}
default: throw CImgException("Error, unknow decompostion axe, dirIdx = '%c'.",dirIdx);
}
}
/*------------------
Main procedure
----------------*/
int main(int argc,char **argv) {
cimg_usage("Perform an 'a trous' wavelet transform (using a cubic spline) on an image or on a video sequence.\n"
"This wavelet transform is undecimated and produces 2 images/videos at each scale. For an example of\n"
"decomposition on a video, try -i img/trees.inr (sequence from the MIT).\n"
"\t(Type -h for help)");
// Read command line parameters
const char
*name_i = cimg_option("-i",cimg_imagepath "parrot.ppm","Input image or video"),
*name_o = cimg_option("-o","","Name of the multiscale analysis output"),
*axe_dec = cimg_option("-axe",(char*)0,
"Perform the multiscale decomposition in just one direction ('x', 'y' or 't')");
const unsigned int
s = cimg_option("-s",3,"Scale of decomposition");
const bool help = cimg_option("-h",false,"Display Help");
if (help) std::exit(0);
// Initialize Image Data
std::fprintf(stderr," - Load image sequence '%s'...\n",cimg::basename(name_i));
const CImg<float> texture_in(name_i);
CImg<float> mask_conv;
CImgList<float> res(s,texture_in.width(),texture_in.height(),texture_in.depth());
CImgList<float> wav(s,texture_in.width(),texture_in.height(),texture_in.depth());
cimglist_for(res,l) { res(l).fill(0.0); wav(l).fill(0.0); }
unsigned int i;
int firstDirIdx = 0,lastDirIdx = 2;
if (axe_dec) { // The multiscale decomposition will be performed in just one direction
char c = cimg::lowercase(axe_dec[0]);
switch(c) {
case 'x': firstDirIdx = 0; break;
case 'y': firstDirIdx = 1; break;
case 't': firstDirIdx = 2; break;
default: throw CImgException("Error, unknow decompostion axe '%c', try 'x', 'y' or 't'",c);
}
lastDirIdx = firstDirIdx; // Only one direction
}
for (i = 0; i<s; i++) {
std::fprintf(stderr," - Performing scale %u ...\n",i + 1);
if (i==0) { res(i) = texture_in;} else { res(i) = res(i - 1); }
for (int di = firstDirIdx; di<=lastDirIdx; di++) {
mask_conv = mask((unsigned char)di,(unsigned char)(i + 1));
res(i) = res(i).get_convolve(mask_conv);
}
if (i==0) { wav(i) = texture_in - res(i); } // res(0) and wav(0) are the 1st scale of decompostion
else { wav(i) = res(i - 1) - res(i); }
}
if (*name_o) {
// Save the Multi-Scale Analysis.
std::fprintf(stderr," - Saving of all output sequences : %s in the msa/ directory... \n",cimg::basename(name_o));
int count = 1; // res0 = original image
char filename[256] = "", filename_wav[256] = "";
char STmp[16] = "";
const int err = std::system("mkdir msa");
if (!err) for (i = 0; i<s; i++) {
std::strcpy( filename, "msa/res" );
std::strcpy( filename_wav, "msa/wav" );
if (count<10) { std::strcat( filename, "0" ); std::strcat( filename_wav, "0" ); }
std::sprintf(STmp,"%d_",count);
std::strcat(filename,STmp); std::strcat(filename_wav,STmp);
std::strcat(filename,name_o); std::strcat(filename_wav,name_o);
res(i).save(filename);
wav(i).save(filename_wav);
count++;
}
}
// Result visualization.
const float col[] = { 255, 255, 255 };
for (i = 0; i<s; i++) {
res[i].normalize(0,255).draw_text(2,2,"Scale %d",col,0,1,13,i);
wav[i].normalize(0,255).draw_text(2,2,"Scale %d",col,0,1,13,i);
}
CImgDisplay disp(res,"Approximations levels by increasing scale",0);
CImgDisplay disp2(wav,"Wavelet coefficients by increasing scale",0);
while (!disp.is_closed() && !disp.is_keyQ() && !disp.is_keyESC() &&
!disp2.is_closed() && !disp2.is_keyQ() && !disp2.is_keyESC()) {
if (disp.is_resized()) disp.resize().display(res);
if (disp2.is_resized()) disp2.resize().display(wav);
CImgDisplay::wait(disp,disp2);
}
return 0;
}
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