How to measure the rotation of a image in MATLAB?

Question

I have two images. One is the original, and the another is rotated.

Now, I need to d

Answer 1

I would take a variant to the above mentioned approach:

% Crude binarization method to knock out background and retain foreground
% features. Note one looses the cube in the middle
im = im > 1

Then I would get the 2D autocorrelation:

acf = normxcorr2(im, im);

From this result, one can easily detect the peaks, and as rotation carries into the autocorrelation function (ACF) domain, one can ascertain the rotation by matching the peaks between the original ACF and the ACF from the rotated image, for example using the so-called Hungarian algorithm.