Consider the example:
% a simple test image with a single white pixel in the center
inpict = zeros(13);
inpict(7,7) = 1;
% generate kernel such that target pixel is centered
fk = [1 1 1 1 1 1 1 0 0 0 0];
% ^ this is the target pixel
fk = fk/sum(fk(:)); % sum-normalize
% apply filter
outpict = imfilter(inpict,fk,'replicate');
imshow(outpict)
