init - 初始化项目

samples/cpp/imagelist_reader.cpp

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+/*
+ *  Created on: Nov 23, 2010
+ *      Author: Ethan Rublee
+ *
+ * A starter sample for using opencv, load up an imagelist
+ * that was generated with imagelist_creator.cpp
+ * easy as CV_PI right?
+ */
+#include "opencv2/imgcodecs.hpp"
+#include "opencv2/highgui.hpp"
+#include <iostream>
+#include <vector>
+
+using namespace cv;
+using namespace std;
+
+static void help(char** av)
+{
+  cout << "\nThis program gets you started being able to read images from a list in a file\n"
+          "Usage:\n./" << av[0] << " image_list.yaml\n"
+       << "\tThis is a starter sample, to get you up and going in a copy pasta fashion.\n"
+       << "\tThe program reads in an list of images from a yaml or xml file and displays\n"
+       << "one at a time\n"
+       << "\tTry running imagelist_creator to generate a list of images.\n"
+        "Using OpenCV version %s\n" << CV_VERSION << "\n" << endl;
+}
+
+static bool readStringList(const string& filename, vector<string>& l)
+{
+  l.resize(0);
+  FileStorage fs(filename, FileStorage::READ);
+  if (!fs.isOpened())
+    return false;
+  FileNode n = fs.getFirstTopLevelNode();
+  if (n.type() != FileNode::SEQ)
+    return false;
+  FileNodeIterator it = n.begin(), it_end = n.end();
+  for (; it != it_end; ++it)
+    l.push_back((string)*it);
+  return true;
+}
+
+static int process(const vector<string>& images)
+{
+    namedWindow("image", WINDOW_KEEPRATIO); //resizable window;
+    for (size_t i = 0; i < images.size(); i++)
+    {
+        Mat image = imread(images[i], IMREAD_GRAYSCALE); // do grayscale processing?
+        imshow("image",image);
+        cout << "Press a key to see the next image in the list." << endl;
+        waitKey(); // wait infinitely for a key to be pressed
+    }
+    return 0;
+}
+
+int main(int ac, char** av)
+{
+  cv::CommandLineParser parser(ac, av, "{help h||}{@input||}");
+  if (parser.has("help"))
+  {
+      help(av);
+      return 0;
+  }
+  std::string arg = parser.get<std::string>("@input");
+  if (arg.empty())
+  {
+    help(av);
+    return 1;
+  }
+  vector<string> imagelist;
+
+  if (!readStringList(arg,imagelist))
+  {
+    cerr << "Failed to read image list\n" << endl;
+    help(av);
+    return 1;
+  }
+
+  return process(imagelist);
+}