How to find the optical flow of the corner point of a red box in a video?

I extracted all the frames of the video.I have to find the optical flow of the left corner of the redbox over subsequent frames.

I have created a red mask for the red box and found the corners using the Harrisfeatures, how do I iterate over all the frames and store the corner points of the red box ina array?

for n=1:150

pic{n}= imread(sprintf('image%03d.png',n));

% points = detectHarrisFeatures(rgb2gray(pic{1}));

red_channel = pic{n}(:, :, 1);

green_channel =pic{n}(:, :, 2);

blue_channel = pic{n}(:, :, 3);

redMask = red_channel > 200 & green_channel < 200 & blue_channel < 200;

points = detectHarrisFeatures(redMask);

end

pointImage = insertMarker(pic{150=}, points.Location, '+', 'Color', 'blue');

Answer 1

[darova]

What about find()?

[y,x] = find(redMask,1,'first')