How does graydist work?

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ILoveMATLAB on 4 May 2022
What does each element of the gray dist transfrom mean with repect to the imputs? How is each element calculated. I think i have use case for a weighted distance transfrom, but I cant understand the function.
% Please note this is part of the example included in the MATLAB
% documentation.
A= magic(3)
A = 3×3
8 1 6
3 5 7
4 9 2
T1 = graydist(A,1,1)
T1 = 3×3
0 4.5000 8.0000
5.5000 6.5000 8.5000
9.0000 11.5000 10.0000
  1. I double checked Digital Image Processing By Rafael Gonzalez. The book only discusses the binary distance transfrom. I understand the binary distance transform.
  2. I searched google/ youtube.
  3. I searched for the cited article but my company does not have access to it.
  4. I looked at the algorithm section. The formula has no disciption of the variables.

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