i try to find the variance by var function but it shoew the error.
I = imread('eight.tif'); var(I)
var requires a double or single argument. This will work:
img = double(imread('eight.tif')); v = var(img);
But note that will give a vector, with one value for the variance of each column of the image. To get the variance of all the pixels in the image, you'll need
v = var(img(:));
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