[TASK] Implement Task#2 Sub 1.

imageviewer-qt4.cpp

@@ -142,6 +142,78 @@ void ImageViewer::acidTrippin() {
   }
 }
 
+/**
+ * Analyze the image, get average luminance
+ * Also fill grayscale_absolute_histogramm
+ * @brief ImageViewer::analyzeImage
+ */
+void ImageViewer::analyzeImage() {
+  if(image!=NULL) {
+    //Zero existing histogramm data first
+    for(int i=0; i<256; i++) {
+      grayscale_absolute_histogramm[i] = 0;
+      grayscale_relative_histogramm[i] = 0;
+    }
+    
+    logFile << "Analyzing image ...";
+    renewLogging();
+    for(int x=0; x<image->width(); x++) {
+      for(int y=0; y<image->height(); y++) {
+	logFile << "(" << x << "," << y << "): ";
+	int r,g,b;
+	QColor color = QColor::fromRgb(image->pixel(x, y));
+	color.getRgb(&r,&g,&b);
+	logFile << "(" << r << "," << g << "," << b << ")";
+	int intensity = (int)(0.299*r+0.587*g+0.114*b);
+	logFile << "(" << intensity << ")";
+	grayscale_absolute_histogramm[intensity] += 1;
+	logFile << std::endl;
+      }
+    }
+    
+    int pixels = image->width()*image->height();
+    for(int i=0; i<256; i++) {
+      grayscale_relative_histogramm[i] = ((1.0*grayscale_absolute_histogramm[i])/(1.0*pixels));
+    }
+    
+    logFile << "done" << std::endl;
+    logFile << "Average intensity: " << getAverageIntensity() << std::endl;
+    logFile << "Intensity variance: " << getIntensityVariance() << std::endl;  
+    renewLogging();
+  }
+}
+
+/**
+ * Use histogramm to retrieve the average intensity.
+ * @brief ImageViewer::getAverageIntensity
+ */
+int ImageViewer::getAverageIntensity() {
+  double sumIntensity = 0;
+  for(int i=0; i<256;i++) {
+    sumIntensity += (i*grayscale_relative_histogramm[i]);
+  }
+  return (int)sumIntensity;
+}
+
+/**
+ * Retrieve the intensity variance from the image.
+ * @brief ImageViewer::getVarianceIntensity
+ */
+int ImageViewer::getIntensityVariance() {
+  int average_intensity = getAverageIntensity();
+  int sumDifference = 0;
+  for(int x=0; x<image->width(); x++) {
+    for(int y=0; y<image->height(); y++) {
+      QColor color = QColor::fromRgb(image->pixel(x, y));
+      int r,g,b;
+      color.getRgb(&r,&g,&b);
+      int intensity = (int)(0.299*r+0.587*g+0.114*b);
+      int diff = std::abs(intensity - average_intensity);
+      sumDifference += diff;
+    }
+  }
+  return (int) (sumDifference/(image->width()*image->height()));
+}
 
 /**************************************************************************************** 
 *   
@@ -155,21 +227,21 @@ void ImageViewer::generateControlPanels() {
   task_tab1 = new QVBoxLayout();
   task_tab_widget1->setLayout(task_tab1);
 
-  button1 = new QPushButton();
+  task_tab1_button1 = new QPushButton();
-  button1->setText("Draw a black line");
+  task_tab1_button1->setText("Draw a black line");
-  QObject::connect(button1, SIGNAL(clicked()), this, SLOT (drawBlackLine()));
+  QObject::connect(task_tab1_button1, SIGNAL(clicked()), this, SLOT (drawBlackLine()));
 
-  button2 = new QPushButton();
+  task_tab1_button2 = new QPushButton();
-  button2->setText("Draw a rainbow cross");
+  task_tab1_button2->setText("Draw a rainbow cross");
-  QObject::connect(button2, SIGNAL(clicked()), this, SLOT (drawRainbowCross()));
+  QObject::connect(task_tab1_button2, SIGNAL(clicked()), this, SLOT (drawRainbowCross()));
 
-  button3 = new QPushButton();
+  task_tab1_button3 = new QPushButton();
-  button3->setText("Start the neverending acid trip!");
+  task_tab1_button3->setText("Start the neverending acid trip!");
-  QObject::connect(button3, SIGNAL(clicked()), this, SLOT (acidTrippin()));
+  QObject::connect(task_tab1_button3, SIGNAL(clicked()), this, SLOT (acidTrippin()));
 
-  button4 = new QPushButton();
+  task_tab1_button4 = new QPushButton();
-  button4->setText("Draw a diagonal cross");
+  task_tab1_button4->setText("Draw a diagonal cross");
-  QObject::connect(button4, SIGNAL(clicked()), this, SLOT (drawDiagonalCross()));
+  QObject::connect(task_tab1_button4, SIGNAL(clicked()), this, SLOT (drawDiagonalCross()));
 
   lineSlider = new QSlider(Qt::Horizontal);
   lineSlider->setMinimum(1);
@@ -178,10 +250,10 @@ void ImageViewer::generateControlPanels() {
   //QObject::connect(lineSlider, SIGNAL(valueChanged(int)), this, SLOT (drawRainbowCross()));
  
   task_tab1->addWidget(new QLabel("Let's draw something!"));
-  task_tab1->addWidget(button1);
+  task_tab1->addWidget(task_tab1_button1);
-  task_tab1->addWidget(button2);
+  task_tab1->addWidget(task_tab1_button2);
-  task_tab1->addWidget(button3);
+  task_tab1->addWidget(task_tab1_button3);
-  task_tab1->addWidget(button4);
+  task_tab1->addWidget(task_tab1_button4);
   task_tab1->addWidget(new QLabel("This will not stop unless process is killed."));
   task_tab1->addWidget(lineSlider);
   task_tab1->addWidget(new QLabel("Sets the width of the cross."));
@@ -190,17 +262,21 @@ void ImageViewer::generateControlPanels() {
 
 
   //Tab for second task
+  task_tab2_button1 = new QPushButton();
+  task_tab2_button1->setText("Analyze image");
+  QObject::connect(task_tab2_button1, SIGNAL(clicked()), this, SLOT (analyzeImage()));
+  
+  QLabel* task_tab2_stats = new QLabel();
+  
   task_tab_widget2 = new QWidget();
   task_tab2 = new QVBoxLayout();
   task_tab_widget2->setLayout(task_tab2);
 
-  spinbox1 = new QSpinBox(tabWidget);
+  task_tab2->addWidget(task_tab2_button1);
-
+  task_tab2->addWidget(task_tab2_stats);
-  task_tab2->addWidget(new QLabel("Here we put some more controls later."));
-  task_tab2->addWidget(spinbox1);
 
   tabWidget->addTab(task_tab_widget2,"Task #2");
-  //tabWidget->show();
+  tabWidget->show();
 
 }
 

imageviewer-qt4.h

@@ -70,10 +70,10 @@ class ImageViewer : public QMainWindow {
     QWidget* task_tab_widget1;
     QVBoxLayout* task_tab1;
 
-    QPushButton* button1;
+    QPushButton* task_tab1_button1;
-    QPushButton* button2;
+    QPushButton* task_tab1_button2;
-    QPushButton* button3;
+    QPushButton* task_tab1_button3;
-    QPushButton* button4;
+    QPushButton* task_tab1_button4;
 
     QSlider* lineSlider;
 
@@ -81,7 +81,12 @@ class ImageViewer : public QMainWindow {
     QWidget* task_tab_widget2;
     QVBoxLayout* task_tab2;
 
-    QSpinBox* spinbox1;
+    QPushButton* task_tab2_button1;
+    QLabel* task_tab2_stats;
+    
+    // "My" space for storing data/results
+    int grayscale_absolute_histogramm[256];
+    double grayscale_relative_histogramm[256];    
 
 
   private slots:
@@ -90,6 +95,7 @@ class ImageViewer : public QMainWindow {
     void drawRainbowCross();
     void drawDiagonalCross();
     void acidTrippin();
+    void analyzeImage();
     
     void open();
     void print();
@@ -110,6 +116,8 @@ class ImageViewer : public QMainWindow {
   private:
     // Custom methods
     void drawRainbowCross(int h);
+    int getAverageIntensity();
+    int getIntensityVariance();
 
     void generateControlPanels();
     void startLogging();