q1
Computing vanishing points (from lines)
Intersect p1q1 with p2q2 
v
p1
p2
q2
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
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