init - 初始化项目

samples/cpp/edge.cpp

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+#include "opencv2/core/utility.hpp"
+#include "opencv2/imgproc.hpp"
+#include "opencv2/imgcodecs.hpp"
+#include "opencv2/highgui.hpp"
+
+#include <stdio.h>
+
+using namespace cv;
+using namespace std;
+
+int edgeThresh = 1;
+int edgeThreshScharr=1;
+
+Mat image, gray, blurImage, edge1, edge2, cedge;
+
+const char* window_name1 = "Edge map : Canny default (Sobel gradient)";
+const char* window_name2 = "Edge map : Canny with custom gradient (Scharr)";
+
+// define a trackbar callback
+static void onTrackbar(int, void*)
+{
+    blur(gray, blurImage, Size(3,3));
+
+    // Run the edge detector on grayscale
+    Canny(blurImage, edge1, edgeThresh, edgeThresh*3, 3);
+    cedge = Scalar::all(0);
+
+    image.copyTo(cedge, edge1);
+    imshow(window_name1, cedge);
+
+    /// Canny detector with scharr
+    Mat dx,dy;
+    Scharr(blurImage,dx,CV_16S,1,0);
+    Scharr(blurImage,dy,CV_16S,0,1);
+    Canny( dx,dy, edge2, edgeThreshScharr, edgeThreshScharr*3 );
+    /// Using Canny's output as a mask, we display our result
+    cedge = Scalar::all(0);
+    image.copyTo(cedge, edge2);
+    imshow(window_name2, cedge);
+}
+
+static void help(const char** argv)
+{
+    printf("\nThis sample demonstrates Canny edge detection\n"
+           "Call:\n"
+           "    %s [image_name -- Default is fruits.jpg]\n\n", argv[0]);
+}
+
+const char* keys =
+{
+    "{help h||}{@image |fruits.jpg|input image name}"
+};
+
+int main( int argc, const char** argv )
+{
+    help(argv);
+    CommandLineParser parser(argc, argv, keys);
+    string filename = parser.get<string>(0);
+
+    image = imread(samples::findFile(filename), IMREAD_COLOR);
+    if(image.empty())
+    {
+        printf("Cannot read image file: %s\n", filename.c_str());
+        help(argv);
+        return -1;
+    }
+    cedge.create(image.size(), image.type());
+    cvtColor(image, gray, COLOR_BGR2GRAY);
+
+    // Create a window
+    namedWindow(window_name1, 1);
+    namedWindow(window_name2, 1);
+
+    // create a toolbar
+    createTrackbar("Canny threshold default", window_name1, &edgeThresh, 100, onTrackbar);
+    createTrackbar("Canny threshold Scharr", window_name2, &edgeThreshScharr, 400, onTrackbar);
+
+    // Show the image
+    onTrackbar(0, 0);
+
+    // Wait for a key stroke; the same function arranges events processing
+    waitKey(0);
+
+    return 0;
+}