Robertson and tutorial

samples/cpp/tutorial_code/photo/hdr_imaging/hdr_imaging.cpp

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+#include <opencv2/photo.hpp>
+#include <opencv2/highgui.hpp>
+#include <vector>
+#include <iostream>
+#include <fstream>
+
+using namespace cv;
+using namespace std;
+
+void loadExposureSeq(String path, vector<Mat>& images, vector<float>& times)
+{
+	path += "/";
+    ifstream list_file((path + "list.txt").c_str());
+    string name; 
+    float val;
+    while(list_file >> name >> val) {
+        Mat img = imread(path + name);
+        images.push_back(img);
+        times.push_back(1 / val);
+    }
+    list_file.close();
+}
+
+int main(int argc, char**argv)
+{
+    vector<Mat> images;
+    vector<float> times;
+    loadExposureSeq(argv[1], images, times);
+
+    Mat response;
+    Ptr<CalibrateDebevec> calibrate = createCalibrateDebevec();
+    calibrate->process(images, response, times);
+
+    Mat hdr;
+    Ptr<MergeDebevec> merge_debevec = createMergeDebevec();
+    merge_debevec->process(images, hdr, times, response);
+
+    Mat ldr;
+    Ptr<TonemapDurand> tonemap = createTonemapDurand(2.2f);
+    tonemap->process(hdr, ldr);
+		
+	Mat fusion;
+    Ptr<MergeMertens> merge_mertens = createMergeMertens();
+    merge_mertens->process(images, fusion);
+		
+    imwrite("fusion.png", fusion * 255);
+    imwrite("ldr.png", ldr * 255);
+    imwrite("hdr.hdr", hdr);
+
+    return 0;
+}