Consider that we perform a transformation of each point using the homography matrix H $=$ h$0$ h$1$ h$2$ h$3$ h$4$ h$5$ h$6$ h$7$ h$8,$ and you have a single line correspondence l $$ l $$ where you know the homogeneous parameters of both lines: l $=$ la lb lc $$ and l $=$ l $$ a l $$ b l $$ c $.$ Write down the constraint equations in terms of la$,$ lb$,$ lc$,$ l$$ a $,$ l$$ b $,$ l$$ c that you can use to estimate h$0,...,$ h$8.$