Add Java and Python code for cascade classifier and HDR tutorials.

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

@@ -1,6 +1,7 @@
-#include <opencv2/photo.hpp>
+#include "opencv2/photo.hpp"
 #include "opencv2/imgcodecs.hpp"
-#include <opencv2/highgui.hpp>
+#include "opencv2/highgui.hpp"
+
 #include <vector>
 #include <iostream>
 #include <fstream>
@@ -10,38 +11,52 @@ using namespace std;
 
 void loadExposureSeq(String, vector<Mat>&, vector<float>&);
 
-int main(int, char**argv)
+int main(int argc, char**argv)
 {
+    CommandLineParser parser( argc, argv, "{@input | | Input directory that contains images and exposure times. }" );
+
+    //! [Load images and exposure times]
     vector<Mat> images;
     vector<float> times;
-    loadExposureSeq(argv[1], images, times);
+    loadExposureSeq(parser.get<String>( "@input" ), images, times);
+    //! [Load images and exposure times]
 
+    //! [Estimate camera response]
     Mat response;
     Ptr<CalibrateDebevec> calibrate = createCalibrateDebevec();
     calibrate->process(images, response, times);
+    //! [Estimate camera response]
 
+    //! [Make HDR image]
     Mat hdr;
     Ptr<MergeDebevec> merge_debevec = createMergeDebevec();
     merge_debevec->process(images, hdr, times, response);
+    //! [Make HDR image]
 
+    //! [Tonemap HDR image]
     Mat ldr;
     Ptr<TonemapDurand> tonemap = createTonemapDurand(2.2f);
     tonemap->process(hdr, ldr);
+    //! [Tonemap HDR image]
 
+    //! [Perform exposure fusion]
     Mat fusion;
     Ptr<MergeMertens> merge_mertens = createMergeMertens();
     merge_mertens->process(images, fusion);
+    //! [Perform exposure fusion]
 
+    //! [Write results]
     imwrite("fusion.png", fusion * 255);
     imwrite("ldr.png", ldr * 255);
     imwrite("hdr.hdr", hdr);
+    //! [Write results]
 
     return 0;
 }
 
 void loadExposureSeq(String path, vector<Mat>& images, vector<float>& times)
 {
-    path = path + std::string("/");
+    path = path + "/";
     ifstream list_file((path + "list.txt").c_str());
     string name;
     float val;