To calculate the size of the convoluted matrix, we use the generalized equation, given by:
C = ((n-f+2p)/s)+1
where,
C is the size of the convoluted matrix.
n is the size of the input matrix.
f is the size of the filter matrix.
p is the Padding amount.
s is the Stride applied.
Here n = 12, f = 3, p = 0, s = 1
Therefore the size of the convoluted matrix is 10 X 10.