Capturing and saving/manipulating a single frame from a camera.
Hi there,
What I am trying to do sounds pretty basic to me, I just can't quite do it.
I saw code online showing how to connect to the camera and stream through it, so I thought, maybe I'll just take this specific frame and do something with it, but apparently that doesn't work.
I used VideoCapture cap and then cap.open to check if it can connect to it. Then, in a loop, something like this:
Mat frame; camp >> frame;
Then according to the code I found online, they refresh a window with the new frame taken every time in the loop. So I thought, as I said before, maybe I could use this one frame and whatnot. But whenever I try to show one specific frame in a window (additional window) the window is blank while the other window still shows the video.
The way I tried showing one frame is by creating another window and using imshow when I was halfway through the loop, just to be sure that the frame is fine and all.
Anyway! I just need to get one frame from this camera, that is it, how do I do it?
If you post your code, maybe we're able to help you
If you need just one frame, use the code you posted, without loop:
Mat frame; cap>>frame; imshow("Look what I captured",frame);If you need to capture continuously, but to keep just one frame, put it in a loop, and when you want to keep a frame, copy it to a new Mat:
int count; Mat frame,keep; while(1){cap>>frame; if(count++==100) frame>>copyto(keep);imshow("kept frame",keep);} }(this code keeps the 100th frame, but captures continuously)