get_window.m

this is a very very very nice code

%This function finds the smallest sub-window in a mask that contains all
%the pixels to be inpainted or synthesized.
%
%Input is a binary mask, where 0 indicates a region to be painted or
%synthesized, and 1 represents all the other regions
function window = get_window(mask)

mask = ~mask;
window = [-1,-1,-1,-1];
%Find the top-most location
for y = 1:size(mask,1)
    if sum(mask(y,:)) > 0
        window(1) = y;
        break;
    end
end

%Find the bottom-most location
for y = size(mask,1):-1:1
    if sum(mask(y,:)) > 0
        window(2) = y;
        break;
    end
end

%Find the leftv-most location
for x = 1:size(mask,2)
    if sum(mask(:,x)) > 0
        window(3) = x;
        break;
    end
end

%Find the right-most location
for x = size(mask,2):-1:1
    if sum(mask(:,x)) > 0
        window(4) = x;
        break;
    end
end