init - 初始化项目

samples/cpp/connected_components.cpp

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+
+#include <opencv2/core/utility.hpp>
+#include "opencv2/imgproc.hpp"
+#include "opencv2/imgcodecs.hpp"
+#include "opencv2/highgui.hpp"
+#include <iostream>
+
+using namespace cv;
+using namespace std;
+
+Mat img;
+int threshval = 100;
+
+static void on_trackbar(int, void*)
+{
+    Mat bw = threshval < 128 ? (img < threshval) : (img > threshval);
+    Mat labelImage(img.size(), CV_32S);
+    int nLabels = connectedComponents(bw, labelImage, 8);
+    std::vector<Vec3b> colors(nLabels);
+    colors[0] = Vec3b(0, 0, 0);//background
+    for(int label = 1; label < nLabels; ++label){
+        colors[label] = Vec3b( (rand()&255), (rand()&255), (rand()&255) );
+    }
+    Mat dst(img.size(), CV_8UC3);
+    for(int r = 0; r < dst.rows; ++r){
+        for(int c = 0; c < dst.cols; ++c){
+            int label = labelImage.at<int>(r, c);
+            Vec3b &pixel = dst.at<Vec3b>(r, c);
+            pixel = colors[label];
+         }
+     }
+
+    imshow( "Connected Components", dst );
+}
+
+int main( int argc, const char** argv )
+{
+    CommandLineParser parser(argc, argv, "{@image|stuff.jpg|image for converting to a grayscale}");
+    parser.about("\nThis program demonstrates connected components and use of the trackbar\n");
+    parser.printMessage();
+    cout << "\nThe image is converted to grayscale and displayed, another image has a trackbar\n"
+            "that controls thresholding and thereby the extracted contours which are drawn in color\n";
+
+    String inputImage = parser.get<string>(0);
+    img = imread(samples::findFile(inputImage), IMREAD_GRAYSCALE);
+
+    if(img.empty())
+    {
+        cout << "Could not read input image file: " << inputImage << endl;
+        return EXIT_FAILURE;
+    }
+
+    imshow( "Image", img );
+
+    namedWindow( "Connected Components", WINDOW_AUTOSIZE);
+    createTrackbar( "Threshold", "Connected Components", &threshval, 255, on_trackbar );
+    on_trackbar(threshval, 0);
+
+    waitKey(0);
+    return EXIT_SUCCESS;
+}