specify camera on command line

[challenge-bot] / bbb / opencv-hello-world / opencv-hello-world.cpp

/*
  Copyright (C) 2015 Daniel Watson
  See the end of the file for license conditions.
*/
/* challenge-bot
   GNU AGPLv3 (or later at your option)
   project available here:
   https://challenge-bot.com/
*/
#include <opencv2/opencv.hpp>

using namespace cv;
using namespace std;

int main(int argc, char** argv) {
  if (argc < 2) {
    cout << "supply a video device index." << endl;
    cout << "probably 0 for beaglebone, 1 for laptop" << endl;
    exit(0); }
  VideoCapture camera(atoi(argv[1]));
  if(!camera.isOpened()) {
    cout << "not opened :( that's bad" << endl;
    exit(-1); }
  Mat frame;
  camera >> frame;
  Mat grey_image;
  cvtColor(frame, grey_image, CV_BGR2GRAY);

  imwrite("image.png", frame);
  imwrite("image-grey.png", grey_image);
  return 0; }

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  You should have received a copy of the GNU Affero General Public License
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*/