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Let's assume we have a random binary texture image $X(i,j)$ that comes from a Markov-Gibbs model with zero boundary conditions.

The probability distribution Gibbs function is: $$Pr(X)=\frac{1}{Z}\exp(-\frac{1}{T}U(X))$$ If we also have an Ising model with cliques of 1 or 2 pixels, if there are horizontal or vertical neighbours, then its energy is given from the following formula:

$$U(X)=\sum_i\sum_j{[aX(i,j)+b_1 X(i,j)X(i-1,j)+b_2X(i,j)X(i,j-1)]}$$

I want to prove that the above energy function can be written in the following form:
$$U(X)=a\cdot card(X)+b_1 \cdot card(X \ominus B_h)+b_2 \cdot card(X\ominus B_u)$$
where $B_h=\{(0,0),(1,0)\}$ and $B_u=\{(0,0),(0,1)\}$ are structural elements and $card(X)$ is the number of pixels of binary image $X$.

Which is the right way to approach this problem? Any help is appreciated! Thanks in advance!

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