Modified to work better

Author: garybradski

example_12-02.cpp

@@ -12,10 +12,15 @@ using std::cout;
 using std::endl;
 using std::vector;
 
+void help(char** argv) {
+        cout  << "\nExample 12-1. Using cv::dft() and cv::idft() to accelerate the computation of convolutions"  
+              << "\nHough Circle detect\nUsage: " << argv[0] <<" <path/imagename>\n" 
+              << "Example:\n" << argv[0] << " ../stuff.jpg\n" << endl;
+}
+
 int main(int argc, char** argv) {
+	help(argv);
     if (argc != 2) {
-        cout  << "\nExample 12-1. Using cv::dft() and cv::idft() to accelerate the computation of convolutions"  
-              << "\nHough Circle detect\nUsage: " << argv[0] <<" <path/imagename>\n" << endl;
         return -1;
     }
 

example_12-03.cpp

@@ -11,6 +11,11 @@ using std::endl;
 cv::Mat img_preview;
 cv::Mat img;
 cv::Mat markers;
+cv::Mat drawRect;
+int x_0 = -1;
+int y_0 = -1; 
+int x_1, y_1;
+int drawr = 0;
 
 bool finished;
 
@@ -34,33 +39,60 @@ static void onMouseClick(int event, int x, int y, int, void*) {
         return;
     }
 
-    if (event == cv::EVENT_LBUTTONDOWN) {
-        cv::ellipse(markers, cv::Point(x, y), cv::Size(1, 1),
+    if (event == cv::EVENT_LBUTTONDOWN && drawr == 0) {
+		if(x_0 < 0) {
+			x_0 = x;
+			y_0 = y;
+			cv::ellipse(markers, cv::Point(x, y), cv::Size(1, 1),
             0, 0, 360, cv::GC_FGD, 3);
-        cv::ellipse(img_preview, cv::Point(x, y), cv::Size(1, 1),
+			cv::ellipse(drawRect, cv::Point(x, y), cv::Size(1, 1),
             0, 0, 360, cv::Scalar(0, 0, 255), 3);
+            drawr = 1;
+		} 
+ 
+        cv::addWeighted(img,0.7,drawRect,0.3, 0, img_preview);
+    
         cv::imshow("image", img_preview);
         return;
     }
-
-    if (event == cv::EVENT_RBUTTONDOWN) {
+    if( event == cv::EVENT_LBUTTONUP) {
+		drawr = 2;
+	}
+    if(drawr == 1) { //Just moving
+			drawRect.setTo(0);
+			cv::rectangle(drawRect, cv::Point(x_0,y_0), cv::Point(x,y), cv::Scalar(0,0,255), -1);
+ 
+			cv::addWeighted(img,0.7,drawRect,0.3, 0, img_preview);
+			x_1 = x; y_1 = y;    
+			cv::imshow("image", img_preview);
+			return;
+	}
+
+    if (drawr == 2) {
         cv::Mat bg;
         cv::Mat fg;
+        cv::rectangle(markers, cv::Point(x_0,y_0), cv::Point(x_1,y_1), cv::GC_PR_FGD, -1);
         cv::grabCut(img, markers, cv::Rect(0, 0, img.cols - 1, img.rows - 1),
             bg, fg, 5, cv::GC_EVAL);
         displayResult();
         return;
     }
 }
 
-int main(int argc, char** argv) {
-    if (argc != 2) {
+void help(char** argv) {
         cout << "\nExample 12-3. Using GrabCut for background removal"
-             << "\n- Use left click on the image to select foreground point"
-             << "\n- Use right clock on the image to perform GrabCut"
+             << "\n- Use left mouse to drag a rectangle over the object"
+             << "\n- On release of left mouse button, we will perform GrabCut"
              << "\n- Press any key to terminate program"
              << "\nUsage: "
-             << argv[0] << " <path/imagename>\n" << endl;
+             << argv[0] << " <path/imagename>\n" 
+             << "\nExample:\n" << argv[0] << " ../stuff.jpg\n" << endl;
+}
+
+
+int main(int argc, char** argv) {
+	help(argv);
+    if (argc != 2) {
         return -1;
     }
 
@@ -74,6 +106,7 @@ int main(int argc, char** argv) {
     markers.setTo(cv::GC_PR_BGD);
 
     img_preview = img.clone();
+    drawRect = img.clone();
 
     finished = false;
 

example_12-04.cpp

@@ -90,15 +90,20 @@ static void onMouseClick(int event, int x, int y, int, void*) {
     }
 }
 
-int main(int argc, char** argv) {
-    if (argc != 2) {
-        cout << "\nExample 12-4. Using Watershed for image segmentation"
+void help(char** argv) {
+       cout << "\nExample 12-4. Using Watershed for image segmentation"
              << "\n- Use left click on the image to place marker for the new segment"
              << "\n- Use right clock on the image to perform Watershed"
              << "\n- Press any key to terminate program"
              << "\nUsage: "
-             << argv[0] << " <path/imagename>\n" << endl;
-        return -1;
+             << argv[0] << " <path/imagename>\n" 
+             << "\nExample:\n" << argv[0] << " ../stuff.jpg\n" << endl;	
+}
+
+int main(int argc, char** argv) {
+	help(argv);
+    if (argc != 2) {
+         return -1;
     }
 
     img = cv::imread(std::string(argv[1]), CV_LOAD_IMAGE_COLOR);