一帧一帧地读取视频流。
- VideoCapture sequence(file_video);
- sequence >> image.
#include <opencv2/core/core.hpp>
#include <opencv2/videoio/videoio.hpp>
#include <opencv2/highgui/highgui.hpp>#include <iostream>using namespace cv;
using namespace std;static void help(char** argv)
{
cout << "\nThis sample shows you how to read a sequence of images using the VideoCapture interface.\n"
<< "Usage: " << argv[0] << " <image_mask> (example mask: example_%02d.jpg)\n"
<< "Image mask defines the name variation for the input images that have to be read as a sequence. \n"
<< "Using the mask example_%02d.jpg will read in images labeled as 'example_00.jpg', 'example_01.jpg', etc."
<< endl;
}int main(int argc, char** argv)
{
cv::CommandLineParser parser(argc, argv, "{help h||}{@image| ../data/768x576.avi |}");
if (parser.has("help"))
{
help(argv);
return 0;
}
string first_file = parser.get<string>("@image");
cout << "first_file = " << first_file << endl; if(first_file.empty())
{
help(argv);
return 1;
} // Jeff --> read video stream.
VideoCapture sequence(first_file); if (!sequence.isOpened())
{
cerr << "Failed to open the image sequence!\n" << endl;
return 1;
} Mat image;
namedWindow("Image sequence | press ESC to close", 1); for(;;)
{
// Read in image from sequence
sequence >> image; // If no image was retrieved -> end of sequence
if(image.empty())
{
cout << "End of Sequence" << endl;
break;
} // Jeff --> we may control the speed here.
imshow("Image sequence | press ESC to close", image);
if(waitKey(500) == 27)
break;
} return 0;
}