Kurtosis function on image
I would like to calculate the Kurtosis of an image in matlab. Matlab has a function kurtosis I can use this function on a matrix. For example:
m = rand([4 5]); kurtosis(m(:));
Though when I use this grayscale image:
I = imread('0.tiff'); kurtosis(I(:));
I get this error:
Error using - Integers can only be combined with integers of the same class, or scalar doubles.
Error in kurtosis (line 39) x0 = x - repmat(nanmean(x,dim), tile);
My question now is: What am I doing wrong, and how can I calculate the kurtosis of an image.
kurtosis needs I to be double. This works: