matlab之俩矩形框的重叠面积及重叠率

function ratio = DecideOberlap(Reframe,GTframe)

%Reframe(x,y,w,h) x,y为左上角坐标

    x1 = Reframe(1);

    y1 = Reframe(2);

    width1 = Reframe(3);

    height1 = Reframe(4);

    x2 = GTframe(1);

    y2 = GTframe(2);

    width2 = GTframe(3);

    height2 = GTframe(4);

    endx = max(x1+width1,x2+width2);%x轴最大值

    startx = min(x1,x2);%x轴最小值

    width = width1+width2-(endx-startx);%重叠矩形宽

    endy = max(y1+height1,y2+height2);%y轴最大值

    starty = min(y1,y2);%y轴最小值

    height = height1+height2-(endy-starty);%重叠矩形宽

    if width<=0||height<=0

        ratio = 0;

        Area=0;

    else

        Area = width*height;%冲得面积

        Area1 = width1*height1;%第一个Box面积

        Area2 = width2*height2;%第二个Box面积

        ratio = Area/(Area1+Area2-Area);%重叠率

    end

end