videostill.cpp

// Copyright: Jan Kučera, 2014
// Code available under GPLv3 license
// License text available at: http://www.gnu.org/copyleft/gpl.html

// Program:
// saving stereo stills from webcam in PPM image format for stereo calibration

#include "opencv2/opencv.hpp"
#include <iostream>
#include <fstream>

using namespace cv;
using namespace std;

int main()
{

    ofstream myfile;
    myfile.open ("filelist.txt");

    int index = 0;

    // note: camera sides (LEFT and RIGHT) are considered when you are FACING the cameras (looking into their lens), not from camera's point of view

    // open cameras
    VideoCapture cap1(1);       // LEFT camera
    VideoCapture cap2(0);       // RIGHT camera

    // check if we succeeded
    if(!cap1.isOpened()) return -1;
    if(!cap2.isOpened()) return -1;

    // create windows
    namedWindow("edges1",1);
    namedWindow("edges2",1);

    // main loop
    for(;;) {

        // create matrices for camera images
        Mat frame1;
        Mat frame2;

        // detect key pressed
        long key = waitKey(1000);

        // get a new frame from cameras
        cap1 >> frame1;
        cap2 >> frame2;

        // show camera images
        imshow("edges1", frame1);
        imshow("edges2", frame2);

        // waitkey was originaly here

        // for debugging - print key code
        // std::cout << "Key code: " << key;

        // if key was pressed
        if (key >= 0) {

            // if ESC is pressed - quit
            if (key == 1048603) {
                myfile.close();
                return 0;
            }

            // if SPACE pressed - save images
            if (key == 1048608) {

                // increment counter
                index++;

                // define variables for strings
                std::string fileName1;
                std::string fileName2;
                // define variables for conversion of int to string
                std::stringstream string1;
                std::stringstream string2;

                // create file paths and names from constant and numbered index
                // string1 << "images/image_L_" << index << ".ppm";
                // string2 << "images/image_R_" << index << ".ppm";
                string1 << "images/image_L_" << index << ".jpg";
                string2 << "images/image_R_" << index << ".jpg";

                // convert it to string
                fileName1 = string1.str();
                fileName2 = string2.str();

                // save image files
                imwrite(fileName1, frame1);
                imwrite(fileName2, frame2);

                myfile << fileName1 << "\n";
                myfile << fileName2 << "\n";
            }
        }
    }
}