#include <iostream>
#include<opencv2/highgui/highgui.hpp>
#include<opencv2/core/core.hpp>
using namespace std;
using namespace cv;
int main(int argc, const char* argv[]) {
VideoCapture cap(0);
if(!cap.isOpened())
{
cout<<"can't open video file"<<endl;
return -1;
}
namedWindow("Myvideo",CV_WINDOW_AUTOSIZE);
while(1)
{
Mat frame;
bool bsuccess=cap.read(frame);
if(!bsuccess)
{
cout<<"can't read a frame"<<endl;
break;
}
imshow("Myvideo",frame);
if(waitKey(30)==27)
{
cout<<"Esc key is pressed by the user"<<endl;
break;
}
}
return 0;
}
上面的代码只是从相机捕捉视频。但我想从此视频中获取图像(即只有一帧)。有人可以告诉我如何做到这一点。我实际上试图删除while循环,这样我就可以只得到一个循环而不是一个接一个(即视频)。并且还删除了“break”语句。
#include <iostream>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/core/core.hpp>`
using namespace std;
using namespace cv;
int main(int argc, const char* argv[]) {
VideoCapture cap(0);
if(!cap.isOpened())
{
cout<<"can't open video file"<<endl;
return -1;
}
namedWindow("Myvideo",CV_WINDOW_AUTOSIZE);
Mat frame;
cap.read(frame);
imshow("Myvideo",frame);
if(waitKey(30)==27)
{
cout<<"Esc key is pressed by the user"<<endl;
}
return 0;
}
但不幸的是,它只是显示一个空白窗口。任何人都可以帮助我...提前谢谢