adding c++ interface to the datamtrix codes of j.

2011-05-25 00:23:50 +00:00
parent 89b5f40ce3
commit 355ad2993a
4 changed files with 200 additions and 24 deletions
--- a/samples/cpp/video_dmtx.cpp
+++ b/samples/cpp/video_dmtx.cpp
@@ -0,0 +1,94 @@
+/*
+ * starter_video.cpp
+ *
+ *  Created on: Nov 23, 2010
+ *      Author: Ethan Rublee
+ *
+ * A starter sample for using opencv, get a video stream and display the images
+ * easy as CV_PI right?
+ */
+#include "opencv2/highgui/highgui.hpp"
+#include <opencv2/objdetect/objdetect.hpp>
+#include <opencv2/imgproc/imgproc.hpp>
+#include <iostream>
+#include <vector>
+#include <stdio.h>
+
+using namespace cv;
+using namespace std;
+
+//hide the local functions in an anon namespace
+namespace
+{
+void help(char** av)
+{
+  cout << "\nThis program justs gets you started reading images from video\n"
+    "Usage:\n./" << av[0] << " <video device number>\n" << "q,Q,esc -- quit\n"
+      << "space   -- save frame\n\n"
+      << "\tThis is a starter sample, to get you up and going in a copy pasta fashion\n"
+      << "\tThe program captures frames from a camera connected to your computer.\n"
+      << "\tTo find the video device number, try ls /dev/video* \n"
+      << "\tYou may also pass a video file, like my_vide.avi instead of a device number"
+      << endl;
+}
+
+int process(VideoCapture& capture)
+{
+  std::vector<DataMatrixCode> codes;
+  int n = 0;
+  char filename[200];
+  string window_name = "video | q or esc to quit";
+  cout << "press space to save a picture. q or esc to quit" << endl;
+  namedWindow(window_name, CV_WINDOW_KEEPRATIO); //resizable window;
+  Mat frame;
+  for (;;)
+  {
+    capture >> frame;
+    if (frame.empty())
+      continue;
+    cv::Mat gray;
+    cv::cvtColor(frame,gray,CV_RGB2GRAY);
+    findDataMatrix(gray, codes);
+    drawDataMatrixCodes(codes, frame);
+    imshow(window_name, frame);
+    char key = (char) waitKey(5); //delay N millis, usually long enough to display and capture input
+    switch (key)
+    {
+    case 'q':
+    case 'Q':
+    case 27: //escape key
+      return 0;
+    case ' ': //Save an image
+      sprintf(filename, "filename%.3d.jpg", n++);
+      imwrite(filename, frame);
+      cout << "Saved " << filename << endl;
+      break;
+    default:
+      break;
+    }
+  }
+  return 0;
+}
+
+}
+
+int main(int ac, char** av)
+{
+
+  if (ac != 2)
+  {
+    help(av);
+    return 1;
+  }
+  std::string arg = av[1];
+  VideoCapture capture(arg); //try to open string, this will attempt to open it as a video file
+  if (!capture.isOpened()) //if this fails, try to open as a video camera, through the use of an integer param
+    capture.open(atoi(arg.c_str()));
+  if (!capture.isOpened())
+  {
+    cerr << "Failed to open a video device or video file!\n" << endl;
+    help(av);
+    return 1;
+  }
+  return process(capture);
+}