Is there any way to get the pixel counts of the segmented image using graphcut

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andhavarapu lokesh
andhavarapu lokesh 2017-2-18
评论： Walter Roberson 2017-2-18
I am using graphcut matlabs
Ncut = (graphcuts(bad3,3,50))
method to segment grayscale image. Is there any way to get the pixel counts? I am getting the segmented image as binary. How to convert the binary image to grayscale and get the pixel count of the segmented grayscale image

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Walter Roberson
Walter Roberson 2017-2-18
nnz(Ncut .* bad3)
nnz((~Ncut) .* bad3)
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andhavarapu lokesh
andhavarapu lokesh 2017-2-18
>> nnz((~Ncut).* bad3); Error using .* Integers can only be combined with integers of the same class, or scalar doubles.
Walter Roberson
Walter Roberson 2017-2-18
https://www.mathworks.com/help/matlab/ref/nnz.html
"n = nnz(X) returns the number of nonzero elements in matrix X."
I presumed here that when you asked for "pixel counts" of a grayscale matrix that you were interested in the number of non-zero grayscale pixels. If you just wanted to know how many entries were there regardless of whether they are 0 or not, then
nnz(Ncut)
nnz(~Ncut)
Another way of writing nnz(Ncut) would be
sum(Ncut(:))
since each entry in Ncut is binary (0 or 1), this counts the number of non-zero entries, which is the same thing nnz does except nnz would be expected to be faster.

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