converted some OpenCV C samples to C++

2010-11-27 23:15:16 +00:00
parent f40e51588b
commit ee3618243d
69 changed files with 22799 additions and 1788 deletions
--- a/samples/cpp/watershed.cpp
+++ b/samples/cpp/watershed.cpp
@@ -0,0 +1,127 @@
+#include "opencv2/imgproc/imgproc.hpp"
+#include "opencv2/highgui/highgui.hpp"
+
+#include <iostream>
+
+using namespace cv;
+using namespace std;
+
+Mat markerMask, img;
+Point prevPt(-1, -1);
+
+void onMouse( int event, int x, int y, int flags, void* )
+{
+    if( x < 0 || x >= img.cols || y < 0 || y >= img.rows )
+        return;
+    if( event == CV_EVENT_LBUTTONUP || !(flags & CV_EVENT_FLAG_LBUTTON) )
+        prevPt = Point(-1,-1);
+    else if( event == CV_EVENT_LBUTTONDOWN )
+        prevPt = Point(x,y);
+    else if( event == CV_EVENT_MOUSEMOVE && (flags & CV_EVENT_FLAG_LBUTTON) )
+    {
+        Point pt(x, y);
+        if( prevPt.x < 0 )
+            prevPt = pt;
+        line( markerMask, prevPt, pt, Scalar::all(255), 5, 8, 0 );
+        line( img, prevPt, pt, Scalar::all(255), 5, 8, 0 );
+        prevPt = pt;
+        imshow("image", img);
+    }
+}
+
+
+int main( int argc, char** argv )
+{
+    char* filename = argc >= 2 ? argv[1] : (char*)"fruits.jpg";
+    Mat img0 = imread(filename, 1), imgGray;
+    
+    if( img0.empty() )
+    {
+        cout << "Usage: watershed <image_name>\n";
+        return 0;
+    }
+
+    cout << "Hot keys: \n"
+            "\tESC - quit the program\n"
+            "\tr - restore the original image\n"
+            "\tw or SPACE - run watershed algorithm\n"
+            "\t\t(before running it, roughly mark the areas on the image)\n"
+            "\t  (before that, roughly outline several markers on the image)\n";
+    
+    namedWindow( "image", 1 );
+
+    img0.copyTo(img);
+    cvtColor(img, markerMask, CV_BGR2GRAY);
+    cvtColor(markerMask, imgGray, CV_GRAY2BGR);
+    markerMask = Scalar::all(0);
+    imshow( "image", img );
+    setMouseCallback( "image", onMouse, 0 );
+
+    for(;;)
+    {
+        int c = waitKey(0);
+
+        if( (char)c == 27 )
+            break;
+
+        if( (char)c == 'r' )
+        {
+            markerMask = Scalar::all(0);
+            img0.copyTo(img);
+            imshow( "image", img );
+        }
+
+        if( (char)c == 'w' || (char)c == ' ' )
+        {
+            int i, j, compCount = 0;
+            vector<vector<Point> > contours;
+            vector<Vec4i> hierarchy;
+            
+            findContours(markerMask, contours, hierarchy, CV_RETR_CCOMP, CV_CHAIN_APPROX_SIMPLE);
+            
+            Mat markers(markerMask.size(), CV_32S);
+            markers = Scalar::all(0);
+            int idx = 0;
+            for( ; idx >= 0; idx = hierarchy[idx][0], compCount++ )
+                drawContours(markers, contours, idx, Scalar::all(compCount+1), -1, 8, hierarchy, INT_MAX);
+
+            if( compCount == 0 )
+                continue;
+            
+            vector<Vec3b> colorTab;
+            for( i = 0; i < compCount; i++ )
+            {
+                int b = theRNG().uniform(180, 230);
+                int g = theRNG().uniform(180, 230);
+                int r = theRNG().uniform(180, 230);
+                
+                colorTab.push_back(Vec3b((uchar)b, (uchar)g, (uchar)r));
+            }
+
+            double t = (double)getTickCount();
+            watershed( img0, markers );
+            t = (double)getTickCount() - t;
+            printf( "execution time = %gms\n", t*1000./getTickFrequency() );
+
+            Mat wshed(markers.size(), CV_8UC3);
+            
+            // paint the watershed image
+            for( i = 0; i < markers.rows; i++ )
+                for( j = 0; j < markers.cols; j++ )
+                {
+                    int idx = markers.at<int>(i,j);
+                    if( idx == -1 )
+                        wshed.at<Vec3b>(i,j) = Vec3b(255,255,255);
+                    else if( idx <= 0 || idx > compCount )
+                        wshed.at<Vec3b>(i,j) = Vec3b(0,0,0);
+                    else
+                        wshed.at<Vec3b>(i,j) = colorTab[idx - 1];
+                }
+
+            wshed = wshed*0.5 + imgGray*0.5;
+            imshow( "watershed transform", wshed );
+        }
+    }
+
+    return 0;
+}