* Created on: Nov 23, 2010
* Author: Ethan Rublee
*
-* A starter sample for using opencv, get a video stream and display the images
+* Modified on: April 17, 2013
+* Author: Kevin Hughes
+*
+* A starter sample for using OpenCV VideoCapture with capture devices, video files or image sequences
* easy as CV_PI right?
*/
-#include "opencv2/highgui/highgui.hpp"
+
+#include <opencv2/highgui/highgui.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;
+ 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) {
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;
+ namedWindow(window_name, WINDOW_NORMAL); //resizable window;
Mat frame;
+
for (;;) {
capture >> frame;
if (frame.empty())
break;
+
imshow(window_name, frame);
- char key = (char)waitKey(5); //delay N millis, usually long enough to display and capture input
+ 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;
+ 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) {
return 1;
}
std::string arg = av[1];
- VideoCapture capture(arg); //try to open string, this will attempt to open it as a video file
+ 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 a video device or video file!\n" << endl;
+ cerr << "Failed to open the video device, video file or image sequence!\n" << endl;
help(av);
return 1;
}