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modules/photo/src/contrast_preserve.cpp

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+/*M///////////////////////////////////////////////////////////////////////////////////////
+//
+//  IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING.
+//
+//  By downloading, copying, installing or using the software you agree to this license.
+//  If you do not agree to this license, do not download, install,
+//  copy or use the software.
+//
+//
+//                           License Agreement
+//                For Open Source Computer Vision Library
+//
+// Copyright (C) 2013, OpenCV Foundation, all rights reserved.
+// Third party copyrights are property of their respective owners.
+//
+// Redistribution and use in source and binary forms, with or without modification,
+// are permitted provided that the following conditions are met:
+//
+//   * Redistribution's of source code must retain the above copyright notice,
+//     this list of conditions and the following disclaimer.
+//
+//   * Redistribution's in binary form must reproduce the above copyright notice,
+//     this list of conditions and the following disclaimer in the documentation
+//     and/or other materials provided with the distribution.
+//
+//   * The name of the copyright holders may not be used to endorse or promote products
+//     derived from this software without specific prior written permission.
+//
+// This software is provided by the copyright holders and contributors "as is" and
+// any express or implied warranties, including, but not limited to, the implied
+// warranties of merchantability and fitness for a particular purpose are disclaimed.
+// In no event shall the Intel Corporation or contributors be liable for any direct,
+// indirect, incidental, special, exemplary, or consequential damages
+// (including, but not limited to, procurement of substitute goods or services;
+// loss of use, data, or profits; or business interruption) however caused
+// and on any theory of liability, whether in contract, strict liability,
+// or tort (including negligence or otherwise) arising in any way out of
+// the use of this software, even if advised of the possibility of such damage.
+//
+//M*/
+
+
+#include "precomp.hpp"
+#include "opencv2/photo.hpp"
+#include <cmath>
+#include <vector>
+#include <limits>
+#include "contrast_preserve.hpp"
+
+using namespace std;
+using namespace cv;
+
+void cv::decolor(InputArray _src, OutputArray _dst, OutputArray _color_boost)
+{
+    CV_INSTRUMENT_REGION();
+
+    Mat I = _src.getMat();
+    _dst.create(I.size(), CV_8UC1);
+    Mat dst = _dst.getMat();
+
+    _color_boost.create(I.size(), CV_8UC3);
+    Mat color_boost = _color_boost.getMat();
+
+    CV_Assert(!I.empty() && (I.channels()==3));
+
+    // Parameter Setting
+    const int maxIter = 15;
+    const double tol = .0001;
+    int iterCount = 0;
+    double E = 0;
+    double pre_E = std::numeric_limits<double>::infinity();
+
+    Mat img;
+    I.convertTo(img, CV_32FC3, 1.0/255.0);
+
+    // Initialization
+    Decolor obj;
+
+    vector <double> Cg;
+    vector < vector <double> > polyGrad;
+    vector <Vec3i> comb;
+    vector <double> alf;
+
+    obj.grad_system(img,polyGrad,Cg,comb);
+    obj.weak_order(img,alf);
+
+    // Solver
+    Mat Mt = Mat(int(polyGrad.size()),int(polyGrad[0].size()), CV_32FC1);
+    obj.wei_update_matrix(polyGrad,Cg,Mt);
+
+    vector <double> wei;
+    obj.wei_inti(comb,wei);
+
+    //////////////////////////////// main loop starting ////////////////////////////////////////
+
+    vector <double> G_pos(alf.size());
+    vector <double> G_neg(alf.size());
+    vector <double> EXPsum(G_pos.size());
+    vector <double> EXPterm(G_pos.size());
+    vector <double> temp(polyGrad[0].size());
+    vector <double> temp1(polyGrad[0].size());
+    vector <double> temp2(EXPsum.size());
+    vector <double> wei1(polyGrad.size());
+
+    while(sqrt(pow(E-pre_E,2)) > tol)
+    {
+        iterCount +=1;
+        pre_E = E;
+
+        for(size_t i=0; i<polyGrad[0].size(); i++)
+        {
+            double val = 0.0;
+            for(size_t j=0; j<polyGrad.size(); j++)
+                val = val + (polyGrad[j][i] * wei[j]);
+            temp[i] = val - Cg[i];
+            temp1[i] = val + Cg[i];
+        }
+
+        for(size_t i=0; i<alf.size(); i++)
+        {
+            const double sqSigma = obj.sigma * obj.sigma;
+            const double pos = ((1 + alf[i])/2) * exp(-1.0 * 0.5 * (temp[i] * temp[i]) / sqSigma);
+            const double neg = ((1 - alf[i])/2) * exp(-1.0 * 0.5 * (temp1[i] * temp1[i]) / sqSigma);
+            G_pos[i] = pos;
+            G_neg[i] = neg;
+        }
+
+        for(size_t i=0; i<G_pos.size(); i++)
+            EXPsum[i] = G_pos[i]+G_neg[i];
+
+        for(size_t i=0; i<EXPsum.size(); i++)
+            temp2[i] = (EXPsum[i] == 0) ? 1.0 : 0.0;
+
+        for(size_t i=0; i<G_pos.size(); i++)
+            EXPterm[i] = (G_pos[i] - G_neg[i])/(EXPsum[i] + temp2[i]);
+
+        for(int i=0; i<int(polyGrad.size()); i++)
+        {
+            double val1 = 0.0;
+            for(int j=0; j<int(polyGrad[0].size()); j++)
+            {
+                val1 = val1 + (Mt.at<float>(i,j) * EXPterm[j]);
+            }
+            wei1[i] = val1;
+        }
+
+        for(size_t i=0; i<wei.size(); i++)
+            wei[i] = wei1[i];
+
+        E = obj.energyCalcu(Cg, polyGrad, wei);
+
+        if(iterCount > maxIter)
+            break;
+    }
+
+    Mat Gray = Mat::zeros(img.size(),CV_32FC1);
+    obj.grayImContruct(wei, img, Gray);
+
+    Gray.convertTo(dst,CV_8UC1,255);
+
+    ///////////////////////////////////       Contrast Boosting   /////////////////////////////////
+
+    Mat lab;
+    cvtColor(I,lab,COLOR_BGR2Lab);
+
+    vector <Mat> lab_channel;
+    split(lab,lab_channel);
+
+    dst.copyTo(lab_channel[0]);
+
+    merge(lab_channel,lab);
+
+    cvtColor(lab,color_boost,COLOR_Lab2BGR);
+}