function [ up down ] = updown(labels,depth,winline)

    labelst = labels;

    window = zeros(winline(3),winline(4));
    whiter = zeros(winline(3),winline(4));

    window = labels(winline(1):winline(1)+winline(3)-1,winline(2):winline(2)+winline(4)-1);
    windowt = window;
    labelst(winline(1):winline(1)+winline(3)-1,winline(2):winline(2)+winline(4)-1) = whiter;

    down = 0;
    up = depth;

    for(i=1:up)
        labelst(labels < i) = labels(labels < i) * 0;
        windowt(window < i) = window(window < i) * 0;

        if(min(min(windowt)) == 0)
            down = i-1;
            windowt = window;
            labelst = labels;
            windowt(window < down) = window(window < down) * 0;
            labelst(labels < down) = labels(labels < down) * 0;
            break;
        end
    end

    for(i=up:-1:down)
        labelst(labels < i) = labels(labels < i) * 0;
        windowt(window < i) = window(window < i) * 0;

        if(min(min(windowt)) == 0)
            up = i+1;
            break;
        end
    end

end