x and y are the locations of all the white pixels in the image. There will likely be tens of thousands of values in each vector. Did you want the x and y of the blob centroid(s) instead?
What if you just stored the x and y in a cell array
ca{h, 1} = x;
ca{h, 2} = y;
Not sure why you have a loop within a loop but maybe you want i instead of h in the lines of code above.
Can we run your code with the demo that ships with MATLAB, rhinos.avi, or do we need your specific video to be attached?
