init - 初始化项目

2022-05-06 01:58:53 +08:00
commit 90a5cc7cb6
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--- a/samples/cpp/videocapture_starter.cpp
+++ b/samples/cpp/videocapture_starter.cpp
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+/**
+* @file videocapture_starter.cpp
+* @brief A starter sample for using OpenCV VideoCapture with capture devices, video files or image sequences
+* easy as CV_PI right?
+*
+*  Created on: Nov 23, 2010
+*      Author: Ethan Rublee
+*
+*  Modified on: April 17, 2013
+*      Author: Kevin Hughes
+*/
+
+#include <opencv2/imgcodecs.hpp>
+#include <opencv2/videoio.hpp>
+#include <opencv2/highgui.hpp>
+
+#include <iostream>
+#include <stdio.h>
+
+using namespace cv;
+using namespace std;
+
+//hide the local functions in an anon namespace
+namespace {
+    void help(char** av) {
+        cout << "The program captures frames from a video file, image sequence (01.jpg, 02.jpg ... 10.jpg) or camera connected to your computer." << endl
+             << "Usage:\n" << av[0] << " <video file, image sequence or device number>" << endl
+             << "q,Q,esc -- quit" << endl
+             << "space   -- save frame" << endl << endl
+             << "\tTo capture from a camera pass the device number. To find the device number, try ls /dev/video*" << endl
+             << "\texample: " << av[0] << " 0" << endl
+             << "\tYou may also pass a video file instead of a device number" << endl
+             << "\texample: " << av[0] << " video.avi" << endl
+             << "\tYou can also pass the path to an image sequence and OpenCV will treat the sequence just like a video." << endl
+             << "\texample: " << av[0] << " right%%02d.jpg" << endl;
+    }
+
+    int process(VideoCapture& capture) {
+        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, WINDOW_KEEPRATIO); //resizable window;
+        Mat frame;
+
+        for (;;) {
+            capture >> frame;
+            if (frame.empty())
+                break;
+
+            imshow(window_name, frame);
+            char key = (char)waitKey(30); //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) {
+    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;
+    }
+    VideoCapture capture(arg); //try to open string, this will attempt to open it as a video file or image sequence
+    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 the video device, video file or image sequence!\n" << endl;
+        help(av);
+        return 1;
+    }
+    return process(capture);
+}