Scene Change Detection code, Subscripted assignment dimension mismatch error

I was trying out this scene change code in the link

http://www.mathworks.com/help/vision/examples/scene-change-detection.html

and I keep getting this error, How can I fix it? Why does it happen?

 Subscripted assignment dimension mismatch.

 Error in IMDB2 (line 88)
        scene_out(:, 2*cols+1:end, :) = I;

Keep in mind I'm running it on a live video stream if that's of any relevance.

Answer 1

[Image Analyst]

Put a breakpoint there and determine what size(scene) is, and what size(I) is, and what 2*cols+1 is. See if size(scene_out, 2)-(2*cols+1)+1 is the same length as I. Just standard debugging. Perhaps you may need to check out this excellent link: http://blogs.mathworks.com/videos/2012/07/03/debugging-in-matlab/