2b106db02f
Also fixed some typos and code alignment Also adapted tutorial CPP samples Fixed some identation problems
102 lines
3.3 KiB
C++
102 lines
3.3 KiB
C++
/*
|
|
* starter_video.cpp
|
|
*
|
|
* Created on: Nov 23, 2010
|
|
* Author: Ethan Rublee
|
|
*
|
|
* A starter sample for using opencv, get a video stream and display the images
|
|
* Use http://datamatrix.kaywa.com/ to generate datamatrix images using strings of length 3 or less.
|
|
* easy as CV_PI right?
|
|
*/
|
|
#include "opencv2/highgui/highgui.hpp"
|
|
#include <opencv2/objdetect/objdetect.hpp>
|
|
#include <opencv2/imgproc/imgproc.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"
|
|
<< "\n"
|
|
<< "DATA:\n"
|
|
<< "Generate a datamatrix from from http://datamatrix.kaywa.com/ \n"
|
|
<< " NOTE: This only handles strings of len 3 or less\n"
|
|
<< " Resize the screen to be large enough for your camera to see, and it should find an read it.\n\n"
|
|
<< 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, CV_WINDOW_KEEPRATIO); //resizable window;
|
|
Mat frame;
|
|
for (;;)
|
|
{
|
|
capture >> frame;
|
|
if (frame.empty())
|
|
break;
|
|
cv::Mat gray;
|
|
cv::cvtColor(frame,gray,COLOR_RGB2GRAY);
|
|
vector<string> codes;
|
|
Mat corners;
|
|
findDataMatrix(gray, codes, corners);
|
|
drawDataMatrixCodes(frame, codes, corners);
|
|
imshow(window_name, frame);
|
|
char key = (char) waitKey(5); //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)
|
|
{
|
|
|
|
if (ac != 2)
|
|
{
|
|
help(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
|
|
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;
|
|
help(av);
|
|
return 1;
|
|
}
|
|
return process(capture);
|
|
}
|