Es++ Sample: ImageThresholding


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 *  ImageThresholding.cpp
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//
#include <es++/Pair.h>
#include <es++/gtkmm-3.0/Application.h>
#include <es++/gtkmm-3.0/Label.h>
#include <es++/gtkmm-3.0/LabeledTrackBar.h>
#include <es++/gtkmm-3.0/FileOpenDialog.h>
#include <es++/opencv-4.0/OpenCVMainView.h>
#include <es++/opencv-4.0/OpenCVScrolledImageView.h>
#include <es++/opencv-4.0/OpenCVScaleComboBox.h>

using namespace Gtk;

namespace Es {

class MainView :public Es::OpenCVMainView {
private:
  /////////////////////////////////////////////////////// 
  //Inner classes start.

  class OriginalImageView :public Es::OpenCVScrolledImageView {
  public:
    OriginalImageView()
    {
    }    
    void rescale(int scaling_ratio)
    {
      OpenCVScrolledImageView::scaleImage(scaling_ratio);
    }
  };

  class BinarizedImageView :public Es::OpenCVScrolledImageView {
  private:
    cv::Mat gray_image;
    cv::Mat binarized_image;

  public:
    BinarizedImageView()
    {
    }

    void loadImage(const std::string& filename, 
        int imageLoadingFlag= CV_LOAD_IMAGE_COLOR,
                int scaling_ratio=100)
    {
      OpenCVScrolledImageView::loadImage(filename, imageLoadingFlag,
                                scaling_ratio);
 
      cv::Mat& original_image = getOriginalImage();
      cv::cvtColor(original_image, gray_image, COLOR_BGR2GRAY);

      binarized_image  = gray_image.clone();
      scaleImage(binarized_image, scaling_ratio);
    }    

   void binarize(int threshold_type, 
               int threshold_value, int scaling_ratio)
    {
      threshold_value = (threshold_value/2)*2 + 1;

      try {
        if (threshold_value <3) {
          threshold_value=3;
        }
        
        cv::threshold( gray_image, binarized_image, threshold_value, 
             THRESHOLD_VALUE_MAX, threshold_type );

      } catch (cv::Exception& ex) {
        //Sometimes we get an exception; I don't know the reason why it happens.
      }      

      scaleImage(binarized_image, scaling_ratio);
    } 

    void rescale(int scaling_ratio)
    {
      OpenCVScrolledImageView::scaleImage(binarized_image, scaling_ratio);
    }
  };
  // Inner classes end.
  /////////////////////////////////////////////////////// 

  Es::Label              filepath;

  Es::HorizontalLayout   horiz_layout;

  Es::VerticalLayout     control_pane;

  OriginalImageView      original_image;

  BinarizedImageView     binarized_image;

  int                    loading_flag;

  Es::OpenCVScaleComboBox scale_combobox;

  int                     threshold_type;
  Es::LabeledComboBox     threshold_type_combobox;
  
  int                     threshold_value;
  Es::LabeledTrackBar     threshold_value_trackbar;

  static const int        THRESHOLD_VALUE_MAX = 255;
 
  int                     scaling_ratio;  //Percentage.
  static const int        CONTROLPANE_WIDTH = 180;

  std::string             filename;
 
  Es::FileOpenDialog      file_dialog;

public:
  //////////////////////////////////////////////
  //Constructor
  //
  MainView(Es::Application& applet, 
          std::string&      name,
          Es::Args&         args)
  :OpenCVMainView(applet, name, args)
  ,scaling_ratio(100)  //100%
  ,file_dialog(*this, Es::FileOpenDialog::IMAGE_FILES)
  {
    int w = (int)args.get(XmNwidth);
    int h = (int)args.get(XmNheight);

    int ratio = (int)args.get(XmNscalingRatio);

    scaling_ratio = OpenCVImageView::validateScale(ratio);

    Es::MainLayout& main_layout = get_main_layout();

    main_layout.pack_start(filepath, FALSE, FALSE, 0);

    main_layout.pack_start(horiz_layout);

    filename = "../../images/flower.png";

    filepath.set_label(filename);
    int ww = (w - CONTROLPANE_WIDTH)/2;

    filepath.set_size_request(w, 30);
    original_image.set_size_request(ww, h);
    binarized_image.set_size_request(ww, h);
    control_pane.set_size_request( CONTROLPANE_WIDTH, h);

    horiz_layout.pack_start(original_image);
    horiz_layout.pack_start(binarized_image);

    horiz_layout.pack_start(control_pane, FALSE, FALSE, 0);

    scale_combobox.set_selection(scaling_ratio);


    const char* types[] = {
        "Binary",
        "Binary Inverted",
        "Threshold Truncated",
        "Threshold to Zero",
        "Threshold to Zero Inverted",
        //"Mask", 
        "Otsu", 
    };
    threshold_type = cv::THRESH_BINARY;
    threshold_type_combobox.set_label("Threshold Type");
    threshold_type_combobox.append_items(types, CountOf(types));
    threshold_type_combobox.set_active_text(types[0]);

    threshold_type_combobox.set_changed_callback(
           sigc::mem_fun(*this, &MainView::threshold_type_changed));
     
    threshold_value = 80;
    threshold_value_trackbar.set_label("BlockSize: [0, 255]");
    threshold_value_trackbar.configure_adjuster(threshold_value,
                      0, THRESHOLD_VALUE_MAX);

    threshold_value_trackbar.set_value_changed_callback(
            sigc::mem_fun(*this, &MainView::threshold_value_changed) );

    control_pane.set_spacing(20);
    control_pane.pack_start(scale_combobox, Gtk::PACK_SHRINK);

    control_pane.pack_start(threshold_type_combobox, Gtk::PACK_SHRINK);
    control_pane.pack_start(threshold_value_trackbar, Gtk::PACK_SHRINK);

    scale_combobox.set_changed_callback(
             sigc::mem_fun(*this, &MainView::scale_changed) );

    loading_flag = IMREAD_COLOR;
    original_image.loadImage(filename, loading_flag, scaling_ratio);
    binarized_image.loadImage(filename, loading_flag, scaling_ratio);

    binarized_image.binarize(threshold_type, 
               threshold_value, scaling_ratio);
    show_all();
  }

  void scale_changed()
  {
    std::string scale = scale_combobox.get_active_text();
    printf("scale_changed %s\n", scale.c_str());
    scaling_ratio = scale_combobox.get_selection();

    original_image.rescale(scaling_ratio);
    binarized_image.rescale(scaling_ratio);
  }

  void threshold_type_changed()
  {
    Es::Pair<int, const char*> types[] = {
      {THRESH_BINARY    ,"Binary" },
      {THRESH_BINARY_INV,"Binary Inverted"  },
      {THRESH_TRUNC     ,"Threshold Truncated" },
      {THRESH_TOZERO    ,"Threshold to Zero" },
      {THRESH_TOZERO_INV,"Threshold to Zero Inverted" },
      {THRESH_OTSU      ,"Otsu" }, 
    };

    std::string text = threshold_type_combobox.get_active_text();
    const char* item = text.c_str();
    for (size_t i = 0; i<CountOf(types); i++) {
      if (strcmp(types[i].second, item) == 0) {
        threshold_type = types[i].first;
      } 
    }
    printf("threshold_type %s\n", text.c_str());
    binarized_image.binarize(threshold_type, 
               threshold_value, scaling_ratio);
  }

  void threshold_value_changed()
  {
    threshold_value = (int)threshold_value_trackbar.get_value();
    
    binarized_image.binarize(threshold_type, 
               threshold_value, scaling_ratio);
  }

  void file_open()
  {
    int rc = file_dialog.popup();

    if (rc == Gtk::RESPONSE_OK) {
      const std::string filename = file_dialog.get_filename();

      filepath.set_label(filename);

      original_image.loadImage(filename, loading_flag, scaling_ratio);
      binarized_image.loadImage(filename, loading_flag, scaling_ratio);

      binarized_image.binarize(threshold_type, 
               threshold_value, scaling_ratio);
    }
  }
};
}


int main(int argc, char** argv)
{
  Es::Environment env;

  try {
    std::string name = argv[0];

    Es::Application applet(argc, argv);

    Es::Args args;
    args.set(XmNx, 20);
    args.set(XmNy, 40);
    args.set(XmNwidth, 900);
    args.set(XmNheight, 400);
    args.set(XmNscalingRatio, 60); //60%
    Es::MainView mainv(applet, name, args);

    mainv.show();

    applet.run(mainv);

  } catch (Es::Exception& ex) {
    caught(ex);

  } catch (...) {
    printf("Get exception \n");
  }
  return 0;
}