Computing vanishing points (from lines)

v

q2

q1

p2

p1

Intersect p1q1 with p2q2

Least squares version • Better to use more than two lines and compute the “closest” point of intersection • See notes by Bob Collins for one good way of doing this: – http://www-2.cs.cmu.edu/~ph/869/www/notes/vanishing.txt