lossy = laplace;

for k=1:6
    height = size(lossy(:,:,1),1);
    width = size(lossy(:,:,1),2);
    
    threshold = max(max(laplace(:,:,k)));
    for i=1:height/(2^(k-1))
        for j=1:width/(2^(k-1))
            if laplace(i,j,k) < threshold
                lossy(i,j,k) = 0;
            end
        end
    end
end