Es++ Sample: HoughCircleDetector


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 *  HoughCircleDetector.cpp
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//
#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 DetectedImageView :public Es::OpenCVScrolledImageView {
  private:
    cv::Mat gray_image;
    cv::Mat detected_image;

  public:
    DetectedImageView()
    {
    }

    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 );

      detected_image  = original_image.clone();
      scaleImage(detected_image, scaling_ratio);
    }    

    int detect(int ksize, int sigma, 
         int threshold1, int paramThreshold,
            int scalingRatio)
    {
      cv::Mat& original_image = getOriginalImage();

      //1 Apply cv::GaussianBlur to the grayImage.
      ksize = (ksize/2)*2 + 1;
      cv::GaussianBlur(gray_image, detected_image, cv::Size(ksize, ksize), 
            (double)sigma, //sigmaX, 
            (double)sigma); //sigmaY

      //2 Apply cv::HoughCircles to the grayImage to detect circles.
      std::vector<Vec3f> circles;

      cv::HoughCircles(detected_image, circles, CV_HOUGH_GRADIENT, 1, 
                 detected_image.rows/8, threshold1, paramThreshold, 0, 0 );

      //3 Put a clone of ogirinalImage to the detectedImage, 
      // since the detectedImage is not necessary any more. 
      detected_image.release();
      detected_image = original_image.clone();

      // Draw the circles detected
      int detectedNumber = circles.size();
      for( size_t i = 0; i < circles.size(); i++ ) {
        Point center(cvRound(circles[i][0]), cvRound(circles[i][1]));
        int radius = cvRound(circles[i][2]);

        //Draw the center of the circle of radius = 3;
        cv::circle(detected_image, center, 3, Scalar(0,255,0), -1, 8, 0 );

        //Draw the outline of the circle of radius.
        cv::circle(detected_image, center, radius, Scalar(0,0,255), 3, 8, 0 );
      }
     
      scaleImage(detected_image, scalingRatio);
      return detectedNumber;
    }

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

  Es::Label              filepath;

  Es::HorizontalLayout   horiz_layout;

  Es::VerticalLayout     control_pane;

  OriginalImageView      original_image;

  DetectedImageView      detected_image;

  int                    loading_flag;

  Es::OpenCVScaleComboBox scale_combobox;

  int                     ksize;  
  Es::LabeledTrackBar     ksize_trackbar;

  int                     sigma; 
  Es::LabeledTrackBar     sigma_trackbar;

  int                     threshold1; 
  Es::LabeledTrackBar     threshold1_trackbar;
 
  int                     paramThreshold;  
  Es::LabeledTrackBar     paramThreshold_trackbar;
 
  int                     scaling_ratio;  //Percentage.
  static const int        CONTROLPANE_WIDTH = 200;

  std::string             filename;
 
  Es::Label               detected_number;

  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/Geometry3.png";

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

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

    horiz_layout.pack_start(original_image);
    horiz_layout.pack_start(detected_image);

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

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

    ksize_trackbar.set_label("GaussianBlur Kernel:[0,31]");
    ksize    = 7;
    ksize_trackbar.configure_adjuster(ksize, 0, 31);

    ksize_trackbar.set_value_changed_callback(
            sigc::mem_fun(*this, &MainView::ksize_changed) );

    sigma_trackbar.set_label("GaussianBlur Sigma:[1,20]");
    sigma    = 2;
    sigma_trackbar.configure_adjuster(sigma, 1, 20);
                
    sigma_trackbar.set_value_changed_callback(
        sigc::mem_fun(*this, &MainView::sigma_changed) );

    threshold1_trackbar.set_label("Canny Threshold1:[0,300]");
    threshold1    = 120;
    threshold1_trackbar.configure_adjuster(threshold1, 0, 300);

    threshold1_trackbar.set_value_changed_callback(
        sigc::mem_fun(*this, &MainView::threshold1_changed) );
            
    paramThreshold_trackbar.set_label("Param Threshold:[0,300]");
    paramThreshold    = 50;
    paramThreshold_trackbar.configure_adjuster(paramThreshold, 0, 300);

    paramThreshold_trackbar.set_value_changed_callback(
       sigc::mem_fun(*this, &MainView::paramThreshold_changed) );

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

    control_pane.pack_start(threshold1_trackbar, Gtk::PACK_SHRINK);
    control_pane.pack_start(paramThreshold_trackbar, Gtk::PACK_SHRINK);
    control_pane.pack_start(detected_number, Gtk::PACK_SHRINK);

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

    int number = detected_image.detect(ksize, sigma, threshold1, 
        paramThreshold, scaling_ratio);
    detected_number.set_number("DetectedNumber:", number);

    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);
    detected_image.rescale(scaling_ratio);
  }

  void ksize_changed()
  {
    ksize = ksize_trackbar.get_value();
    int number = detected_image.detect(ksize, sigma, threshold1, 
    paramThreshold, scaling_ratio);
    detected_number.set_number("DetectedNumber:", number);
  }

  void sigma_changed()
  {
    sigma = sigma_trackbar.get_value();
    int number = detected_image.detect(ksize, sigma, threshold1, 
    paramThreshold, scaling_ratio);
    detected_number.set_number("DetectedNumber:", number);
  }

  void threshold1_changed()
  {
    threshold1 = threshold1_trackbar.get_value();
    int number = detected_image.detect(ksize, sigma, threshold1, 
    paramThreshold, scaling_ratio);
    detected_number.set_number("DetectedNumber:", number);
  }
  
  void paramThreshold_changed()
  {
    paramThreshold = paramThreshold_trackbar.get_value();
    int number = detected_image.detect(ksize, sigma, threshold1, 
    paramThreshold, scaling_ratio);
    detected_number.set_number("DetectedNumber:", number);
  }

  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);
      detected_image.loadImage(filename, loading_flag, scaling_ratio);

      int number = detected_image.detect(ksize, sigma, threshold1, 
    paramThreshold, scaling_ratio);
      detected_number.set_number("DetectedNumber:", number);
    }
  }
};
}


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, 440);
    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;
}