2-D convolution - MATLAB conv2 - MathWorks
https://www.mathworks.com/help/matlab/ref/conv2.html
WEB2-D convolution, returned as a vector or matrix. When A and B are matrices, then the convolution C = conv2(A,B) has size size(A)+size(B)-1. When [m,n] = size(A), p. = length(u), and q = length(v), then the convolution C = conv2(u,v,A) has m+p-1 rows and n+q-1 columns.
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