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101 lines
2.8 KiB
C++
101 lines
2.8 KiB
C++
/*
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* starter_video.cpp
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*
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* Created on: Nov 23, 2010
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* Author: Ethan Rublee
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*
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* A starter sample for using opencv, get a video stream and display the images
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* Use http://datamatrix.kaywa.com/ to generate datamatrix images using strings of length 3 or less.
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* easy as CV_PI right?
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*/
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#include "opencv2/highgui/highgui.hpp"
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#include <opencv2/objdetect/objdetect.hpp>
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#include <opencv2/imgproc/imgproc.hpp>
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#include <iostream>
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#include <vector>
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#include <stdio.h>
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using namespace cv;
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using namespace std;
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//hide the local functions in an anon namespace
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namespace
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{
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void help(char** av)
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{
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cout << "\nThis program justs gets you started reading images from video\n"
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"Usage:\n./" << av[0] << " <video device number>\n" << "q,Q,esc -- quit\n"
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<< "space -- save frame\n\n"
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<< "\tThis is a starter sample, to get you up and going in a copy pasta fashion\n"
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<< "\tThe program captures frames from a camera connected to your computer.\n"
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<< "\tTo find the video device number, try ls /dev/video* \n"
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<< "\tYou may also pass a video file, like my_vide.avi instead of a device number"
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<< "\n"
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<< "DATA:\n"
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<< "Generate a datamatrix from from http://datamatrix.kaywa.com/ \n"
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<< " NOTE: This only handles strings of len 3 or less\n"
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<< " Resize the screen to be large enough for your camera to see, and it should find an read it.\n\n"
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<< endl;
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}
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int process(VideoCapture& capture)
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{
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std::vector<DataMatrixCode> codes;
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int n = 0;
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char filename[200];
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string window_name = "video | q or esc to quit";
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cout << "press space to save a picture. q or esc to quit" << endl;
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namedWindow(window_name, CV_WINDOW_KEEPRATIO); //resizable window;
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Mat frame;
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for (;;)
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{
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capture >> frame;
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if (frame.empty())
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break;
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cv::Mat gray;
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cv::cvtColor(frame,gray,CV_RGB2GRAY);
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findDataMatrix(gray, codes);
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drawDataMatrixCodes(codes, frame);
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imshow(window_name, frame);
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char key = (char) waitKey(5); //delay N millis, usually long enough to display and capture input
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switch (key)
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{
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case 'q':
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case 'Q':
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case 27: //escape key
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return 0;
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case ' ': //Save an image
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sprintf(filename, "filename%.3d.jpg", n++);
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imwrite(filename, frame);
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cout << "Saved " << filename << endl;
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break;
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default:
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break;
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}
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}
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return 0;
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}
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}
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int main(int ac, char** av)
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{
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if (ac != 2)
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{
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help(av);
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return 1;
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}
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std::string arg = av[1];
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VideoCapture capture(arg); //try to open string, this will attempt to open it as a video file
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if (!capture.isOpened()) //if this fails, try to open as a video camera, through the use of an integer param
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capture.open(atoi(arg.c_str()));
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if (!capture.isOpened())
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{
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cerr << "Failed to open a video device or video file!\n" << endl;
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help(av);
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return 1;
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}
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return process(capture);
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}
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