[silas_xue]

lz 不知道我理解你的意图是否正确？

pseudo:
Suppose p(i,j) is the current pixel, p_n(i,j) is the result updated
for i,j across the image
p_n(i,j) = 1/4(p(i-1,j)+p(i+1,j)+p(i,j-1)+p(i,j+1)) %% for average calculation
%% Or p_n(i,j) = 1/5(p(i-1,j)+p(i+1,j)+p(i,j-1)+p(i,j+1))+p(i,j)) for average calculation with the p(i,j) itself in calculation
%% Or temp_set = (p(i-1,j),p(i+1,j),p(i,j-1),p(i,j+1)) p_n(i,j) = median(temp_set) for Median calculation
%% Or temp_set = (p(i-1,j),p(i+1,j),p(i,j-1),p(i,j+1),p(i,j)) p_n(i,j) = median(temp_set) for Median calculation with the p(i,j) itself in calculation
end