Question

I have a number of frames from a video sequence that I use to estimate optical flow fields in between:

[u, v] = compute_optical_flow(series);

I can play the video sequence using implay:

implay(series);

And I can plot a single flow on top of a single image using quiver:

imshow(series(123,:,:));
hold on;
quiver(u(123,:,:), v(123,:,:));

However, I also want to be able to play the whole time series of velocity-vectors stored in u and v (if possible on top of the corresponding image frames). So what I am looking for is implay but for velocity fields instead of images.

Any ideas?

Thanks!

Answer 1

The simple hack is to use the pause MATLAB function. You code should look something like this:

framesPerSecond = 30;

for n = 1:N %# Here N is the number of frames you have
    imshow(series(n,:,:));
    hold on;
    quiver(u(n,:,:), v(n,:,:));
    hold off;
    pause(1/framesPerSecond);
end