text: #include <iostream>
  #include BLIK_OPENCV_U_opencv2__core__core_hpp //original-code:"opencv2/core/core.hpp"
  #include BLIK_OPENCV_U_opencv2__core__ocl_hpp //original-code:"opencv2/core/ocl.hpp"
  #include BLIK_OPENCV_U_opencv2__core__utility_hpp //original-code:"opencv2/core/utility.hpp"
  #include BLIK_OPENCV_U_opencv2__imgproc__imgproc_hpp //original-code:"opencv2/imgproc/imgproc.hpp"
  #include BLIK_OPENCV_U_opencv2__imgcodecs_hpp //original-code:"opencv2/imgcodecs.hpp"
  #include BLIK_OPENCV_U_opencv2__videoio_hpp //original-code:"opencv2/videoio.hpp"
  #include BLIK_OPENCV_U_opencv2__highgui__highgui_hpp //original-code:"opencv2/highgui/highgui.hpp"
  
  using namespace cv;
  using namespace std;
  
  Ptr<CLAHE> pFilter;
  int tilesize;
  int cliplimit;
  
  static void TSize_Callback(int pos)
  {
      if(pos==0)
          pFilter->setTilesGridSize(Size(1,1));
      else
          pFilter->setTilesGridSize(Size(tilesize,tilesize));
  }
  
  static void Clip_Callback(int)
  {
      pFilter->setClipLimit(cliplimit);
  }
  
  int main(int argc, char** argv)
  {
      const char* keys =
          "{ i input    |                    | specify input image }"
          "{ c camera   |  0                 | specify camera id   }"
          "{ o output   | clahe_output.jpg   | specify output save path}"
          "{ h help     | false              | print help message }";
  
      cv::CommandLineParser cmd(argc, argv, keys);
      if (cmd.has("help"))
      {
          cout << "Usage : clahe [options]" << endl;
          cout << "Available options:" << endl;
          cmd.printMessage();
          return EXIT_SUCCESS;
      }
  
      string infile = cmd.get<string>("i"), outfile = cmd.get<string>("o");
      int camid = cmd.get<int>("c");
      VideoCapture capture;
  
      namedWindow("CLAHE");
      createTrackbar("Tile Size", "CLAHE", &tilesize, 32, (TrackbarCallback)TSize_Callback);
      createTrackbar("Clip Limit", "CLAHE", &cliplimit, 20, (TrackbarCallback)Clip_Callback);
  
      UMat frame, outframe;
  
      int cur_clip;
      Size cur_tilesize;
      pFilter = createCLAHE();
  
      cur_clip = (int)pFilter->getClipLimit();
      cur_tilesize = pFilter->getTilesGridSize();
      setTrackbarPos("Tile Size", "CLAHE", cur_tilesize.width);
      setTrackbarPos("Clip Limit", "CLAHE", cur_clip);
  
      if(infile != "")
      {
          imread(infile).copyTo(frame);
          if(frame.empty())
          {
              cout << "error read image: " << infile << endl;
              return EXIT_FAILURE;
          }
      }
      else
          capture.open(camid);
  
      cout << "\nControls:\n"
           << "\to - save output image\n"
           << "\tm - switch OpenCL <-> CPU mode"
           << "\tESC - exit\n";
  
      for (;;)
      {
          if(capture.isOpened())
              capture.read(frame);
          else
              imread(infile).copyTo(frame);
          if(frame.empty())
              continue;
  
          cvtColor(frame, frame, COLOR_BGR2GRAY);
          pFilter->apply(frame, outframe);
  
          imshow("CLAHE", outframe);
  
          char key = (char)waitKey(3);
          if(key == 'o')
              imwrite(outfile, outframe);
          else if(key == 27)
              break;
          else if(key == 'm')
          {
              ocl::setUseOpenCL(!cv::ocl::useOpenCL());
              cout << "Switched to " << (ocl::useOpenCL() ? "OpenCL enabled" : "CPU") << " mode\n";
          }
      }
      return EXIT_SUCCESS;
  }
  