how to calculate the background variance(BV) an detail varaince(DV) of an image in matlab?? Thanks in advance

std=(stdfilt(temp,ones(5))); %local standard deviation
Lvar=(std.^2); % local variance

Background Variance??

Detail Variance??

[Walter Roberson]

it is not a good idea to name a variable std as that will interefere with using the function std()